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

I'm currently a 38D but need a bigger cup size and band size

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Where can I find bras that are in between sizes? 34B is too small

What size are you in bra and underwear? - Quora

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I bought 38d bra the band size is correct but the cup is big? - Quora

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