Bengal-stripe uniform shirts: shrinkage allowance, marker direction and a fabric shortfall

Principle: shrinkage is measured on the fabric, so the pattern must be enlarged by the same percentage in the same direction. Warp runs along the length of the body, so the length grows by the warp figure; weft runs across, so widths grow by the weft figure. Work from finished measurements and add seam allowances afterwards.

• Back length: 72 x 1.040 = 74.9 cm (about 75 cm).
• Chest: 96 x 1.015 = 97.4 cm, so the half-chest on the pattern becomes 48.7 cm.
• The same logic has to be applied to sleeve length (warp), yoke depth, collar band length (weft) and pocket placement, which is why the whole pattern set is re-drafted rather than patched piece by piece.

Why pre-shrinking is often better here:

1. The 4% figure is a mill laboratory average for the roll. Actual shrinkage varies from roll to roll and across the width, so one compensation figure over-corrects some shirts and under-corrects others.
2. Compensating the pattern does not stop the garment changing after the customer's first wash in colour, hand and stripe alignment; a pre-shrunk (sanforized or washed) fabric gives a stable garment.
3. Enlarging every piece wastes 4% of fabric on 180 shirts. The safe route is to wash a specimen from the actual delivered roll, confirm the shrinkage figure, and then decide between pre-shrinking the roll and compensating the pattern - not to trust the mill note alone.

What is wrong: a bengal stripe is a directional design. Turning alternate pieces in opposite directions saves fabric but reverses the stripe direction on those pieces, so the stripes will run one way on the left front and the other way on the right front, at the yoke, and on the collar and cuffs. On a striped fabric a one-way marker is compulsory, and stripe matching at the centre front placket, side seams, yoke and pocket also has to be allowed for.

Consequences:

• The 12 stitched shirts must be examined piece by piece. If the stripe direction is consistent within each visible area and matched at the centre front and side seams, they can be offered as seconds at a reduced price with the customer's written agreement. If not, they are rejects and the fabric and labour are lost.
• The 40 cut pieces are mostly usable only as smaller components (yokes, cuffs, facings) or for recutting, since a reversed panel cannot be corrected by stitching.

Fabric needed: the one-way marker plus matching adds roughly 6-8% over the plain marker. 1.35 x 1.08 = 1.46 m per shirt; 180 x 1.46 = 263 m against 250 m received, and 40 shirts are already cut. Even ignoring the loss, the unit is at least 15-25 m short and must order more of the same dye lot before cutting the balance, or the shirts will differ in shade.

1. Wash test on the delivered roll, not the mill note: cut a 30 cm square, mark 20 cm gauge lengths in warp and weft, wash at the customer's stated temperature, dry and re-measure. Record the figures on the cutting ticket.
2. Stripe and shade check: compare the new roll against the already-cut roll under the same light; keep shade bands separate and number them.
3. Pre-production sample stitched from the corrected pattern, washed, and approved in writing by the customer before bulk cutting.
4. Marker audit: one-way layout confirmed, grain line parallel to the stripe, stripe-matching allowances at centre front, side seams and yoke, notches and balance marks shown, ply height within the fabric's limit.
5. Cutting record: cut plan reconciled against 180 shirts (sizes, plies per size), first-piece approval from the cut lay, bundle tickets with shade band, size and quantity.
6. Reconciliation of the 40 already-cut shirts: what is salvageable, what is written off, and how the loss is charged. Without these records the unit cannot tell the customer what went wrong, cannot claim against the mill, and will repeat the error on the next order.