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Question 1Fundamentals of Apparel and Textile Materials
Which natural fibre is obtained from the seed hair of a plant and is composed mainly of cellulose?
- Wool
- Silk
- Jute
- Cotton Correct answer.
Explanation
Cotton is a seed fibre harvested from the boll of the cotton plant and is roughly 90 percent cellulose, which makes it absorbent and breathable. Wool and silk are protein fibres of animal origin, and jute is a bast fibre taken from the stem.
Question 2Fundamentals of Apparel and Textile Materials
In the standard textile conversion system, how many yards are there in one metre approximately?
- 1.0936 yards Correct answer.
- 2.2046 yards
- 0.9144 yards
- 1.5000 yards
Explanation
One metre equals 100 centimetres, and one yard equals 91.44 centimetres, so a metre is slightly longer than a yard at about 1.0936 yards. The value 0.9144 is the reverse conversion, yards into metres.
Question 3Fundamentals of Apparel and Textile Materials
Which spinning method is used to convert short staple fibres such as cotton into yarn by drafting and twisting a continuous ribbon of fibres?
- Film splitting
- Ring spinning Correct answer.
- Melt spinning
- Wet spinning
Explanation
Ring spinning drafts a roving of staple fibres and inserts twist with a traveller and ring, producing a strong, versatile staple yarn. Melt spinning and wet spinning are filament extrusion methods for man-made polymers, and film splitting produces tape yarns from film.
Question 4Fundamentals of Apparel and Textile Materials
A plain weave fabric is described by which interlacing pattern?
- Each warp yarn floats over four weft yarns before interlacing
- Each warp yarn passes alternately over one and under one weft yarn Correct answer.
- Each warp yarn passes over two and under two weft yarns
- Warp yarns interlace with every fifth weft yarn only
Explanation
Plain weave is the simplest interlacing, where every warp end crosses alternately over and under each weft pick, giving a firm, flat fabric such as poplin or calico. Two-and-two interlacing describes a twill or basket variation, and long floats belong to satin or float designs.
Question 5Fundamentals of Apparel and Textile Materials
Which weft knitting structure is produced on a circular machine and can be unravelled from the last course, forming the fabric used for most T-shirts?
- Interlock
- Rib
- Single jersey Correct answer.
- Warp knit
Explanation
Single jersey has face loops on one side and reverse loops on the other and is knitted on circular weft machines, giving a lightweight fabric that runs or unroves from the last course. Rib and interlock are double-faced structures with different loop arrangements.
Question 6Fundamentals of Apparel and Textile Materials
Which dye class is applied to cotton from an alkaline bath and forms an insoluble coloured pigment inside the fibre after oxidation?
- Basic dye
- Acid dye
- Disperse dye
- Vat dye Correct answer.
Explanation
Vat dyes are reduced to a soluble leuco form in an alkaline bath, absorbed by the cellulose fibre, then oxidised back to an insoluble pigment trapped inside the fibre, giving excellent wash fastness. Acid and basic dyes are used mainly on protein or acrylic fibres, and disperse dyes suit polyester.
Question 7Fundamentals of Apparel and Textile Materials
Which laundry care symbol indicates that the article must not be bleached?
- A triangle crossed by a diagonal line Correct answer.
- A circle inside a square crossed by a line
- A square with a circle inside
- An iron with one dot
Explanation
The bleach symbol is a triangle, and a diagonal cross through it means bleaching is prohibited. A square with a circle denotes tumble drying, an iron with one dot means low heat, and a crossed tumble-dry symbol means do not tumble dry.
Question 8Fundamentals of Apparel and Textile Materials
In garment manufacturing, what does the term 'grainline' mark on a pattern piece?
- The seam allowance width
- The direction of the warp yarns along which the pattern should be placed Correct answer.
- The position of the buttonholes
- The direction of the fabric selvedge
Explanation
The grainline is a straight line printed on the pattern that must be aligned parallel to the warp, or lengthwise, yarns of the fabric so the garment hangs correctly. It is not the selvedge itself, and it carries no information about buttons or seam allowance.
Question 9Fundamentals of Apparel and Textile Materials
A fabric sample of 10 cm by 10 cm contains 24 warp yarns and 20 weft yarns. What is the fabric sett expressed as ends per inch and picks per inch?
- About 9.4 ends and 7.9 picks per inch
- About 61 ends and 51 picks per inch Correct answer.
- About 12 ends and 10 picks per inch
- 24 ends and 20 picks per inch
Explanation
One inch equals 2.54 cm, so counts per 10 cm are multiplied by 2.54 to give counts per inch. Thus 24 ends per 10 cm becomes about 61 ends per inch and 20 picks becomes about 51 picks per inch.
Question 10Fundamentals of Apparel and Textile Materials
Which fibre property explains why viscose rayon garments lose strength markedly when wet and must be handled gently during laundering?
- Thermoplastic behaviour
- Low moisture regain
- Low wet tenacity of regenerated cellulose Correct answer.
- High elasticity
Explanation
Regenerated cellulose fibres such as viscose absorb water readily, and the absorbed water disrupts hydrogen bonding so wet tenacity falls to roughly half of dry tenacity. This is why wet rayon is weaker and more easily stretched or torn.
Question 11Fundamentals of Apparel and Textile Materials
A buyer orders 600 metres of fabric of 150 cm width. If the fabric weight is 120 g/m², what is the approximate total weight of the order?
- 108 kg
- 1.08 kg
- 10.8 kg Correct answer.
- 72 kg
Explanation
Area equals length times width, so 600 m times 1.5 m gives 900 m². Multiplying by 120 g/m² gives 108,000 g, which is 108 kg; the option 10.8 kg corresponds to a width of only 15 cm.
Question 12Fundamentals of Apparel and Textile Materials
Why is a twill weave such as denim preferred for durable workwear?
- It has no crimp in either yarn system
- It produces a very open, sheer fabric
- It relies on long satin floats for smoothness
- The diagonal floats give higher yarn density and abrasion resistance Correct answer.
Explanation
In twill, warp and weft yarns float over two or more opposite yarns, packing more yarn into the fabric and producing a compact, abrasion-resistant structure with a characteristic diagonal line. This density and float structure make twill suitable for jeans and uniforms.
Question 13Fundamentals of Apparel and Textile Materials
Which test instrument is used to measure the tensile strength of a yarn or fabric strip by stretching it at a constant rate until it breaks?
- Crockmeter
- Martindale abrasion tester
- Universal tensile testing machine Correct answer.
- Moisture regain oven
Explanation
A tensile testing machine clamps the specimen and applies a controlled increasing load at a constant extension rate, recording breaking load and elongation. The Martindale tester measures abrasion, the crockmeter measures colour rubbing fastness, and an oven measures moisture content.
Question 14Fundamentals of Apparel and Textile Materials
A dyer wants to match a shade on polyester fabric. Which dye class and application condition is most appropriate?
- Direct dye applied in a neutral bath at 60 °C
- Reactive dye applied with alkali at room temperature
- Vat dye applied with sodium hydrosulphite
- Disperse dye applied at high temperature under pressure near 130 °C Correct answer.
Explanation
Polyester is hydrophobic and tightly packed, so disperse dyes, which are sparingly soluble and have affinity for the fibre, are applied at high temperature, often around 130 °C under pressure, to swell the fibre and allow dye penetration. Direct, reactive and vat dyes are intended for cellulose fibres.
Question 15Fundamentals of Apparel and Textile Materials
Which finish is applied to cotton fabric to reduce shrinkage and creasing by cross-linking cellulose chains?
- Singeing
- Mercerisation
- Resin or easy-care finish Correct answer.
- Calendering
Explanation
Resin finishes such as DMDHEU cross-link cellulose chains, restricting their movement and so reducing shrinkage and crease formation. Mercerisation improves lustre and strength, calendering smooths the surface, and singeing burns off protruding fibres.
Question 16Fundamentals of Apparel and Textile Materials
In a garment factory, which seam type is formed by folding a single piece of fabric and stitching the folded edges together, commonly used on sheer fabrics and hems?
- French seam Correct answer.
- Flat fell seam
- Lapped seam
- Plain seam
Explanation
A French seam encloses the raw edges inside a folded and stitched tube, producing a neat finish on both sides, which suits lightweight and sheer fabrics. Plain seams leave raw edges exposed, lapped seams overlap two pieces, and flat fell seams are used on heavy fabrics such as denim.
Question 17Fundamentals of Apparel and Textile Materials
A knitted fabric is described as having Wales per centimetre of 8 and Courses per centimetre of 10. What does this indicate about the fabric?
- Wales and courses are unrelated to stitch density
- It has more wales than courses and will stretch more widthwise
- The fabric is woven rather than knitted
- It has more courses than wales and will be denser lengthwise Correct answer.
Explanation
Wales are the vertical columns of stitches and courses are the horizontal rows. A higher course count than wale count means more rows per centimetre, giving greater lengthwise density and generally less lengthwise extensibility.
Question 18Fundamentals of Apparel and Textile Materials
Which property of silk explains its high lustre and smooth handle compared with cotton?
- Its short staple length and high crimp
- Its hollow lumen and irregular surface
- Its high lignin content
- Its triangular cross-section and smooth continuous filament Correct answer.
Explanation
Silk is extruded as a continuous filament with a smooth, roughly triangular cross-section, so light reflects evenly and the surface feels smooth. Cotton is a short, flattened, convoluted staple fibre, and lignin is associated with jute and coir rather than silk.
Question 19Fundamentals of Apparel and Textile Materials
A manufacturer wants a fabric that stretches and recovers well for sportswear. Which combination is most suitable?
- 100 percent woven cotton poplin
- 100 percent woven jute fabric
- Stiff nonwoven polyester felt
- Elastane blended with cotton in a single jersey knit Correct answer.
Explanation
Elastane provides high extensibility and recovery, and a single jersey knit adds further stretch through loop structure, giving comfortable sportswear. Woven cotton poplin, jute and nonwoven felt have little or no stretch and poor recovery.
Question 20Fundamentals of Apparel and Textile Materials
Which colour fastness test assesses the transfer of dye from a coloured fabric onto a white cloth rubbed against it under dry and wet conditions?
- Crocking fastness test Correct answer.
- Light fastness test
- Perspiration fastness test
- Wash fastness test
Explanation
Crocking fastness measures colour transfer by rubbing the specimen with a white test cloth, either dry or wet, and grading the staining against a grey scale. Wash, light and perspiration fastness assess different agencies of colour loss.
Question 21Fundamentals of Apparel and Textile Materials
A pattern requires 2.5 metres of 112 cm wide fabric. If the buyer instead chooses 150 cm wide fabric of the same type, what is the main practical effect on consumption?
- Consumption doubles because width and length are directly proportional
- Consumption usually decreases because more pattern pieces fit across the wider width Correct answer.
- Consumption increases because wider fabric has more shrinkage
- Consumption is unchanged because fabric width never affects layout
Explanation
A wider fabric allows more pattern pieces to be placed side by side in the marker, so the required length, and therefore total consumption, generally falls. Width and length are not directly proportional, and shrinkage is a separate property of the fabric.
Question 22Fundamentals of Apparel and Textile Materials
Why does mercerisation of cotton improve its dye uptake and lustre?
- It coats the fibre with a resin layer
- It converts cellulose into a protein fibre
- It swells the fibre and alters its cross-section from flattened to rounder Correct answer.
- It removes the cellulose entirely
Explanation
Treatment with strong caustic soda under tension swells the cotton fibre, making its collapsed, flattened cross-section rounder and more uniform. The rounder fibre reflects light better, giving lustre, and the increased accessible surface and amorphous regions raise dye uptake.
Question 23Fundamentals of Apparel and Textile Materials
A fabric is labelled 40s count in the indirect cotton count system. What does this indicate about the yarn?
- The yarn has 40 twists per inch
- 40 hanks of 840 yards weigh one pound Correct answer.
- One pound of yarn contains 40 yards
- The yarn is 40 times heavier than a single cotton yarn
Explanation
In the indirect cotton count, the number gives how many hanks of 840 yards are contained in one pound, so a 40s yarn has 40 such hanks per pound. A higher count therefore means a finer yarn, and the figure says nothing about twist level.
Question 24Fundamentals of Apparel and Textile Materials
During wet processing, a polyester-cotton blend is dyed. Why is a two-stage or union dyeing approach required?
- Bleaching alone will colour the blend permanently
- Only acid dye will colour both fibres
- Disperse dye is needed for polyester and a cellulose dye for cotton Correct answer.
- Both components have identical dye affinity
Explanation
Polyester and cotton have very different chemical structures and dye affinities, so disperse dyes are used for the polyester portion and reactive or vat dyes for the cotton portion. A single dye class rarely gives a solid shade on both components.
Question 25Fundamentals of Apparel and Textile Materials
In fabric testing, which statement best explains why a satin weave shows lower abrasion resistance than a plain weave of the same yarn and weight?
- Satin yarns are always made of weaker fibres
- Satin has more interlacing points per unit area
- Satin has a much higher crimp level throughout
- Satin has longer floats that are easily snagged and abraded Correct answer.
Explanation
Satin is built on long floats with few interlacing points, so the exposed yarn lengths can be caught and rubbed away easily, reducing abrasion resistance. Plain weave has the maximum number of interlacings, which binds the yarns firmly and spreads abrasive wear.
Question 26Fundamentals of Apparel and Textile Materials
Which natural fibre is obtained from the stem (bast) of a plant and is composed mainly of cellulose with a high proportion of lignin and pectin that must be removed during retting and processing?
- Jute Correct answer.
- Silk
- Wool
- Asbestos
Explanation
Jute is a bast fibre harvested from the stem of Corchorus plants and consists largely of cellulose with lignin and pectin that are removed by retting. Wool and silk are animal proteins, while asbestos is a mineral fibre, so only jute fits the description of a stem-derived cellulose fibre.
Question 27Fundamentals of Apparel and Textile Materials
A spinner produces a yarn from cotton fibres that have been combed to remove short fibres and align the long ones parallel before spinning. Which yarn property is most directly improved by this combing operation?
- Elastic recovery under high stretch
- Thermal insulation of the yarn
- Yarn evenness, strength and lustre Correct answer.
- Resistance to mildew and rot
Explanation
Combing removes short fibres and neps and arranges the remaining long fibres parallel, giving a smoother, more even, stronger and more lustrous yarn. Mildew resistance, insulation and elastic recovery depend on the fibre type and yarn bulk rather than on the removal of short fibres.
Question 28Fundamentals of Apparel and Textile Materials
A plain-weave cotton fabric is described as having a balanced sett. What does this indicate about the fabric structure?
- The yarns are all filament rather than staple
- The fabric has been given a permanent press finish
- The number of warp and weft yarns per unit length is approximately equal Correct answer.
- The warp yarns are twice as thick as the weft yarns
Explanation
A balanced sett means the ends per unit length and picks per unit length are roughly the same, producing a square, symmetrical plain weave. Yarn thickness ratio, finishing treatments and filament versus staple character are separate matters not implied by the term balanced sett.
Question 29Fundamentals of Apparel and Textile Materials
A garment for a hospital is required to resist penetration by water-based liquids while still allowing air to pass through for comfort. Which fabric property combination should the technologist specify?
- High water absorbency with rapid wicking
- High air permeability with no liquid resistance
- Water repellency with air permeability Correct answer.
- Waterproof coating with zero porosity
Explanation
Water repellency reduces wetting by aqueous liquids while retaining open pores so that air can still pass, giving protection with comfort. A fully waterproof coating blocks air as well as liquid, absorbent wicking fabric draws liquid in, and a fully permeable fabric offers no liquid barrier.
Question 30Fundamentals of Apparel and Textile Materials
Two plain-weave fabrics are woven from yarns of the same count, but fabric A uses a low twist factor and fabric B a high twist factor in both warp and weft. Compared with fabric A, which set of expected differences best describes fabric B?
- Lower yarn cohesion, greater hairiness and increased pilling
- Lower tensile strength, higher extensibility and a softer, bulkier handle
- Higher tensile strength, lower extensibility and a firmer, harsher handle Correct answer.
- Higher extensibility, higher loft and improved thermal insulation
Explanation
Increasing twist binds the fibres more tightly, raising yarn strength and reducing the ability of the yarn to extend, while making the fabric firmer and harsher. Low twist gives the opposite result, with softer, bulkier and more extensible yarns that are weaker and more hairy.
Question 31Pattern Making and Grading
In commercial pattern making, what does the term 'grading' specifically mean?
- Converting a design sketch into a first pattern draft
- Increasing or decreasing a base size pattern to produce the full size range Correct answer.
- Tracing a personal paper pattern from a ready-made garment
- Adding seam allowance and hem allowance to a drafted block
Explanation
Grading is the systematic process of deriving the other sizes in a range from one perfected base size, using consistent grade rules. It is not the same as drafting a new pattern or adding construction allowances, which belong to pattern development rather than size grading.
Question 32Pattern Making and Grading
Which set of body measurements is essential before drafting a basic bodice block?
- Bust, waist, hip and back neck-to-waist length Correct answer.
- Head circumference, shoulder slope and wrist girth
- Chest depth, sleeve length and collar size
- Inseam, outseam and knee circumference
Explanation
A bodice block is built from torso measurements, so bust, waist, hip and the back neck-to-waist length are the core inputs. These define the width, the waist position and the balance of the block.
Question 33Pattern Making and Grading
On a commercial pattern, what does the grain line arrow indicate?
- The position of the buttonhole placement
- How the pattern piece must be aligned with the fabric selvedge Correct answer.
- Where the pattern must be cut on the bias
- The direction of the fabric's greatest stretch
Explanation
The grain line arrow shows how to place the piece so that its lengthwise direction runs parallel to the selvedge. Correct alignment keeps the garment hanging and fitting as designed and prevents twisting.
Question 34Pattern Making and Grading
What is the purpose of a notch on a pattern piece?
- To show the fold line of the fabric
- To mark matching points so seams align correctly during stitching Correct answer.
- To indicate where a dart must be pressed open
- To indicate the seam allowance width
Explanation
Notches are balance marks that let the maker match two seam edges precisely when joining pieces. When notches meet, the seam lengths and shapes correspond as intended.
Question 35Pattern Making and Grading
Which tool is most appropriate for drawing smooth curved lines such as a neckline or armhole on a pattern?
- A seam ripper
- A tracing wheel
- A French curve Correct answer.
- A tailor's square
Explanation
A French curve is a shaped ruler designed for drawing and truing smooth curves such as necklines, armholes and crotch curves. Straight-edged tools cannot reproduce these curves accurately.
Question 36Pattern Making and Grading
A pattern is marked 'cut 2 on fold'. What does this instruction require?
- Place the fold line of the pattern on the fabric fold and cut one mirrored pair Correct answer.
- Cut two pieces on the bias and join them at the centre
- Cut two separate pieces, each from a folded fabric layer
- Cut the piece twice from different fabrics and layer them
Explanation
'Cut 2 on fold' means the pattern edge is placed against a fabric fold so that opening the cut yields two symmetrical pieces. This is used for centre-front or centre-back pieces that must be mirrored.
Question 37Pattern Making and Grading
What is a 'toile' (muslin) used for in pattern making?
- A test garment made in inexpensive fabric to check fit and design Correct answer.
- A paper template used only for grading
- A final garment made in the fashion fabric
- A decorative facing applied to a neckline
Explanation
A toile is a trial garment stitched in a low-cost fabric such as calico to test fit, balance and design lines before cutting the final fabric. Corrections made on the toile are transferred back to the pattern.
Question 38Pattern Making and Grading
Why is a centre-back seam often used in a fitted bodice block?
- To reduce fabric consumption during cutting
- To eliminate the need for a waist dart
- To make the block suitable only for knit fabrics
- To allow shaping for the back curve and a zip insertion Correct answer.
Explanation
A centre-back seam lets the pattern follow the curve of the spine and provides a clean place to insert a zip. It also gives extra shaping that a straight folded centre back cannot provide.
Question 39Pattern Making and Grading
A basic skirt block is graded from size 10 to size 12. If the hip grade rule is 2 cm per size, how much larger is the hip circumference of size 12 compared with size 10?
- 4 cm Correct answer.
- 1 cm
- 8 cm
- 2 cm
Explanation
The grade rule of 2 cm applies to each single size step, so moving from size 10 to size 12 covers two steps. Two steps multiplied by 2 cm gives a 4 cm increase in hip circumference.
Question 40Pattern Making and Grading
When grading a bodice from a smaller to a larger size, how is the bust grade typically distributed across the pattern?
- Entirely on the centre-front seam only
- Equally across every dart and seam regardless of position
- Entirely on the shoulder seam
- Split between the side seam and the front/back panels in a set ratio Correct answer.
Explanation
Bust circumference increase is normally divided among the side seams and the front and back panels according to a fixed ratio, so the shape grows evenly. Concentrating the increase in one seam would distort the balance of the garment.
Question 41Pattern Making and Grading
What is a 'grade point' on a pattern?
- The point where the seam allowance ends
- The highest point of the shoulder seam
- A specific marked location from which grade increments are applied Correct answer.
- The centre of a bust dart
Explanation
Grade points are the reference locations, such as side-seam intersections at bust, waist and hip, from which the grade rules move the pattern. Consistent placement of grade points keeps sizes proportional.
Question 42Pattern Making and Grading
Why is it necessary to true the seams after grading a pattern?
- To convert the pattern into a digital file
- To check that adjoining seam lengths match and curves flow smoothly Correct answer.
- To add seam allowance to the graded pieces
- To reduce the number of sizes in the range
Explanation
Grading can introduce small mismatches between seams that must join, so truing checks and corrects seam lengths and curve shapes. Without truing, the graded garment may not sew together cleanly.
Question 43Pattern Making and Grading
A trouser block is graded for the rise. Which measurement does the rise grade directly affect?
- The width of the collar
- The length of the sleeve
- The circumference of the ankle
- The depth from waist to crotch line Correct answer.
Explanation
Rise is the vertical distance from the waist line to the crotch line, so grading the rise changes this depth. It affects how the trouser sits on the body rather than any circumference measurement.
Question 44Pattern Making and Grading
In a size range, what does the 'base size' mean?
- The size from which all other sizes are graded Correct answer.
- The largest size in the range
- The size with the most seam allowance
- The smallest size in the range
Explanation
The base size is the perfected pattern from which the rest of the range is derived by applying grade rules. It is usually a mid-range size chosen because it represents the average fit.
Question 45Pattern Making and Grading
Which factor most directly determines the grade increment for a given body dimension?
- The colour of the final garment
- The width of the fabric roll
- The number of buttons on the front
- The difference in that body measurement between consecutive sizes Correct answer.
Explanation
Grade increments are derived from the measured change in a body dimension from one size to the next. The pattern must grow by the same amount the body grows to preserve fit.
Question 46Pattern Making and Grading
A dart on a graded pattern appears too short in the larger sizes. What is the standard grading approach for darts?
- Lengthen the dart progressively in larger sizes while keeping its intake proportional Correct answer.
- Remove the dart entirely in larger sizes
- Double the dart intake for every size step
- Leave dart length unchanged across all sizes
Explanation
Dart length must increase in larger sizes because the body curve it accommodates becomes deeper, while the intake grows proportionally with the surrounding grade. Keeping the dart fixed would cause the dart point to sit incorrectly on the body.
Question 47Pattern Making and Grading
What is the main advantage of computer-aided pattern grading over manual grading?
- It guarantees the garment will fit every body type
- It applies grade rules consistently and quickly across many sizes Correct answer.
- It removes the need for a base size pattern
- It eliminates the need for a toile
Explanation
CAD grading applies stored grade rules uniformly to all points and sizes, reducing human error and saving time. It still depends on a correct base pattern and rule set.
Question 48Pattern Making and Grading
A skirt block has a waist dart intake of 3 cm at the base size. If the waist grade is 1 cm per size and the dart takes one third of the waist increase, how much does the dart intake grow per size?
- 0.5 cm
- 1 cm
- 0.33 cm Correct answer.
- 3 cm
Explanation
One third of the 1 cm waist increase is approximately 0.33 cm, so the dart intake grows by that amount per size. The remaining waist increase is distributed to the side seams and other darts.
Question 49Pattern Making and Grading
When grading a sleeve to match a graded armhole, what must be maintained?
- The cuff circumference must equal the bicep circumference
- The sleeve length must be reduced in larger sizes
- The sleeve cap height must remain identical in every size
- The sleeve cap curve length must correspond to the armhole seam length plus ease Correct answer.
Explanation
A sleeve sets into an armhole only if its cap curve matches the armhole length plus the intended ease. When the armhole is graded, the sleeve cap must be graded in step so the two still fit together.
Question 50Pattern Making and Grading
A pattern maker finds that a graded size 14 bodice has a side seam longer than the corresponding front and back side seams combined. Which correction is most appropriate?
- Increase the seam allowance on the side seam
- Add a dart to shorten the side seam
- Remove the side seam entirely
- Re-check the grade points and truing at the side seam to restore matching lengths Correct answer.
Explanation
Mismatched side seam lengths indicate an error in grade point placement or a failure to true the seam after grading. The correct fix is to review the grade points and true the seam so adjoining lengths match.