Short answer
Under-seat allowance re-drafted; the cloth follows the curve instead of hanging.
Why it happens
Under-seat curve steeper than the draft.
Why ready-to-wear cannot fix it
Size charts grade uniformly; deep under-curve 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
Under-seat allowance re-drafted; the cloth follows the curve instead of hanging. 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 39 of 48 · Reviewed by Bonturberg Editorial Review · 2026-09-08