FA-97532 / Knitting and sewing pattern grading / Member archive

Pattern size selector: fit tolerance · case 02

A 93 cm bust is sized up to L although M (92 cm) is within the 1 cm tolerance.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Chart (cm) XS 80/62/86, S 86/68/92, M 92/74/98, L 100/82/106, XL 108/90/114 (bust/waist/hip). Inches convert at 2.54. A size fits a measurement when chart + 1 cm >= body; pick the smallest fitting size. top: by bust; skirt: the larger of waist size and hip size; dress: bust size and hip size, same -> that size, else "grade A to B" (bust size to hip size). No fitting size -> "out of range"; other garments -> "error: garment".

Why this case matters

Sewists choose a pattern size per body zone and grade between sizes.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
regression: fit tolerance	`"L"`	`"M"`	Failed

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