FA-97698 / Knitting and sewing pattern grading / Member archive

Full and small bust adjustment: cup banding · case 03

A 4 cm difference is called a B cup instead of an A cup.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

d = full - high bust (cm); negative -> "error: measurements". Cup index = floor(d/2.5) capped at the last of AA, A, B, C, D, DD, E. delta = index - index(drafted_cup). kind "none", "FBA" (delta > 0) or "SBA". Total adjustment 2.5 cm per cup, per side = total/2; if per side > 4 cm append " (redraft)". Return [cup, kind, per_side float].

Why this case matters

Sewists compare their cup size to the pattern draft cup and perform full or small bust adjustments.

One recorded failure

Sample boundary fixture

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

Boundary fixture	Actual	Expected	Outcome
small bust	`["A", "SBA", 2.5]`	`["AA", "SBA", 3.75]`	Failed

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