Fit
Size, without the theatre.
Band from the underbust, rounded up to the even inch. Cup from the difference to the fullest point. We cut 26AA–52K — designed, not adjusted.
Band
Measure firmly under the bust, exhale. Convert to inches, round up to the next even number. That is your band. 26 through 52.
Cup
Measure at the fullest point, standing. Subtract the underbust. Each 2 cm (about 1 inch) is a cup: AA, A, B, C, D, DD, DDD, F, G, H, I, J, K.
If the number is uncertain
Use the fit calculator in the custom builder. Twenty minutes. No guesswork.