UPMSP Vocational Dressmaking & Decoration common mistakes
UPMSP Vocational Dressmaking & Decoration · Understand the traps and how to avoid them.
Writing the standard seam-allowance figure for a plain seam as 0.5 cm because that is what the practice sheet showed, instead of the 1.5 cm (or 1 cm for fine fabrics) taught for a plain seam.
Candidates memorise whichever number appears in their last practice sheet or notebook rather than linking allowance to seam type and fabric weight. Many also confuse the 1 cm drafting allowance used on pattern outlines with the 1.5 cm plain-seam allowance.
What to do instead
Build a one-page reference table: plain seam 1.5 cm, French seam 1 cm plus 0.5 cm, lapped seam 1 cm, hem 2.5-5 cm depending on garment. Rehearse it by drafting the same bodice three times with different seam types and writing the allowance beside each seam line.
Mixing up warp and weft when identifying a fabric swatch, or labelling the selvedge as the cut edge, in a short-answer textile question.
Candidates learn warp and weft as words but never handle a raw swatch. Without the habit of fraying an edge or stretching the cloth, they guess from the print direction, which can run either way.
What to do instead
Practise the physical tests: warp yarns are stronger and less stretchy, weft frays more easily, selvedge is the firm woven edge. Fray one edge of ten different swatches and record which direction gives way first, then write the identification steps from memory.
Drafting the bodice block without checking that the front and back armscye depths and side seams match, then discovering the mismatch only at the stitching stage.
Candidates draft front and back on separate sheets and never walk the seams. Under exam time pressure they skip the check step that a tailor does automatically.
What to do instead
Make 'walking the seams' a fixed routine: pin front to back at the shoulder and side seam and confirm equal lengths before cutting. In the exam, write the check as a numbered step in the drafting answer, since examiners award marks for it.
Cutting the fabric without first straightening the grain line or without allowing for shrinkage and nap, so the finished garment hangs twisted or the checks do not match.
Candidates treat cutting as a race and lay the pattern on the fabric as it comes off the bolt. They also forget that one-way prints and corduroy need all pattern pieces laid in the same direction.
What to do instead
Adopt a fixed laying sequence: tear or cut along the grain, press, fold right sides together, place pattern with grain line parallel to selvedge, pin, check nap direction, then cut. Practise on a checked fabric and mark the matching points before cutting.
Skipping the backstitch at the start and end of a machine seam, so the seam opens up during fitting or washing.
Candidates focus on stitching a straight line and treat the ends as an afterthought, or they backstitch too far and pucker the fabric.
What to do instead
Practise three-stitch backstitching on scrap until it becomes automatic, and add it as the last item on a personal stitching checklist. In practical exams, demonstrate it deliberately on the first seam so the examiner sees it.
Describing a decorative technique in words only, without naming the materials, the sequence of steps, or the finished effect, in an answer about embroidery, appliqué or mirror work.
Candidates revise decoration as a list of technique names and never learn the process, so they cannot fill the marks allotted to method and effect.
What to do instead
For each technique on the syllabus, write a four-line card: materials, preparation, working steps, finishing. Then work one small sample of each and photograph it beside the card, so the answer can be recalled as a process rather than a label.
Submitting a garment with visible puckering at the neckline or armhole because the facing or bias strip was stitched without clipping or understitching the seam allowance.
Candidates attach the facing and stop there, unaware that curved seams must be clipped and the allowance understitched to lie flat. They also skip pressing at each stage.
What to do instead
Learn the curved-edge routine: staystitch, clip to but not through the stitching, understitch the facing, press. Rehearse it on a scrap curve three times before applying it to the final garment, and press after every construction step.
Answering fitting questions by naming the alteration only (for example 'take in the side seam') without stating the direction, amount, and effect on the adjoining seam or dart.
Candidates know the vocabulary of alterations but have never pinned a real alteration on a body or toile, so they cannot describe the knock-on effect.
What to do instead
Practise on a half-scale toile: pin the alteration, measure the amount, note which seam or dart must move with it, and write the instruction in full. Build a table of common figure faults with the matching alteration and its side effects.
Storing a stained or unwashed garment, or leaving an iron standing face-down on the fabric, and then losing marks on care and equipment questions.
Candidates treat care as common sense and do not revise the specific rules: stain removal before storage, cool iron for synthetics, cleaning the iron soleplate, storing woollens with moth repellent.
What to do instead
Write a care-and-storage checklist covering stain removal, wash temperature, drying, ironing temperature by fibre, and seasonal storage. Pair it with a fibre chart so each rule is attached to a fibre rather than memorised as a list.
Calculating the costing of a garment from fabric price alone and omitting thread, buttons, lining, labour, overheads and wastage, or forgetting to add the profit margin to the cost price.
Candidates confuse cost price with selling price and treat trims as negligible. They also forget the 5-10 per cent wastage allowance on fabric.
What to do instead
Use a fixed costing sheet: fabric with wastage, trims, lining, labour hours times rate, overheads, total cost, then profit percentage, then selling price. Work through two or three complete examples with real prices and check each line before totalling.