Short answer
Crotch curve re-drafted shallower — the correction that makes trousers feel like nothing.
Why it happens
Front-to-back crotch depth shorter than the block.
Why ready-to-wear cannot fix it
Size charts grade uniformly; short crotch length is a personal geometry. A block adjusted in one place pulls in another — which is why the correction must exist in the pattern, not in the fitting-room mirror.
How the house drafts for it
Crotch curve re-drafted shallower — the correction that makes trousers feel like nothing. The correction is recorded in your Fit Passport, so every later commission starts from it automatically.
Where it matters most
This correction carries most for: trousers. It is reviewed at every fitting, in every city, for every garment.
Fit Library entry 46 of 48 · Reviewed by Bonturberg Editorial Review · 2026-09-08