Short answer
The waistband is cut to the asymmetry; the pattern remembers it for every later pair.
Why it happens
Waist height differs left to right — universal, unrecorded.
Why ready-to-wear cannot fix it
Size charts grade uniformly; asymmetric waist 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
The waistband is cut to the asymmetry; the pattern remembers it for every later pair. 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, womens suit. It is reviewed at every fitting, in every city, for every garment.
Fit Library entry 24 of 48 · Reviewed by Bonturberg Editorial Review · 2026-09-08