Bodice Block Correction for a Full Bust and Sloping Shoulders
An advanced trainee is drafting a bodice block for a client whose measurements are: bust 98 cm, high bust 90 cm, waist 86 cm, hip 102 cm, shoulder 40 cm, front neck-to-waist 43 cm, back neck-to-waist 39 cm, and apex-to-apex 20 cm. She selects a commercial size-38 block drafted for bust 92 cm and simply adds 1.5 cm to each side seam to reach 98 cm. The cotton toile shows the front waistline riding up about 2 cm, horizontal drag lines from the apex to the side seam, front armhole gaping, and excess sleeve-cap ease at the bicep; the back fits. The client also has slightly sloping shoulders. The block has 1.5 cm seam allowances and a 12 cm bust dart. The trainee has only one metre of toile cotton left and must decide whether to adjust the pattern or start again from a smaller block.
1. Explain why adding 1.5 cm to each side seam cannot correct this fit, using the measurements. What does the high bust figure tell you?
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Adding 1.5 cm to each of the four side seams gives 6 cm extra circumference, which matches 98 − 92 = 6 cm numerically, but it adds the same amount at the waist, underarm and back. The client's high bust is 90 cm and full bust 98 cm, an 8 cm difference; the size-38 block is drafted for roughly a 4-5 cm bust-to-high-bust difference. Most of the extra volume is in front, over the bust, not at the side. Side-seam addition therefore adds width without adding length over the apex, so the front waist rides up, drag lines run from the apex to the side, and the front armhole gapes because the front is wider but the armhole depth and shoulder slope are unchanged. The back fits because it was not the problem. The correct starting point is a block chosen by high bust, then a full-bust adjustment that opens the dart and lowers the apex; the back needs at most 1 cm per side seam, not 1.5 cm.
2. Outline the pattern correction sequence, including seam allowances, dart, armhole and sloping shoulder.
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- Trace the size-38 block; remove the 1.5 cm additions. 2. Mark the apex and the bust line; draw a line from the apex to the side seam and another from the apex to the waist. 3. Cut from the side seam to the apex and from the waist to the apex, leaving a hinge at the apex. 4. Pivot the side section to open about 2 cm at the side seam and 1.5 cm at the waist; this adds front width and length and enlarges the dart. 5. Redraw the dart, keeping its point 2 cm from the apex; the dart intake becomes about 14 cm, and the extra waist width is taken into the dart. 6. Lower the front waistline by 1.5-2 cm and true the side seam; add 1 cm to each back side seam only. 7. Lower the shoulder point by 0.5 cm at the neck and 1 cm at the armhole for the sloping shoulder, then redraw the armhole. 8. Reduce sleeve-cap ease by 0.5-1 cm and reshape the cap to the new armhole. 9. Add 1.5 cm seam allowances to all seams and 4 cm to the hem; mark grainline and notches. Make a new cotton toile.
3. In what order will you check the toile, and what will you accept before cutting the final fabric?
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Check in this order: centre-front and centre-back verticality; shoulder seam length and slope; neckline lie; bust apex position and dart direction; front length over bust; armhole shape and gaping; side seams; waistline level; sleeve cap ease and bicep; hem. Pin the toile closed, ask the client to sit, raise arms and breathe; a bodice that only looks right standing is not accepted. Acceptance criteria: centre front and back vertical within 0.5 cm; front and back waistlines level within 0.5 cm; no drag lines from apex to side; armhole lies flat with 1 cm ease; dart points 2 cm from apex and neither ends at the apex; sleeve cap has 2-3 cm ease for a non-stretch cotton and no puckers; shoulder slope follows the body. Mark all changes on the toile in a different colour, transfer to the paper pattern, then make a second toile in the same cotton before cutting the final fabric. With one metre left, do not skip the second toile; cut it in two half-front pieces if necessary.