Bra Making: What is Sister Sizing? • Cloth Habit

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Have you heard the term “sister sizing”? It’s a great term for explaining how bra sizes shift in band and cups. The basic idea is this: Sister sizing refers to the same cup but on a different size band. As a bra band size gets smaller, the same cup volume will have a bigger letter, and vice versa. In other words, a B is not a B is not a B. A 36B is a full cup size larger than a 34B. So I’m not just “basically a C cup”. Nor is someone else