What sister size bra should I get if 38b is a little too big on

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What are the cup sizes of a bra? - Quora

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Would big bra cup size women wear plunge push up bras with padding? - Quora

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What is the sister bra size to a 42GG? - Quora

Where can I find bras that are in between sizes? 34B is too small for me, but a 34C-cup is too big. - Quora