If I wear a 38C in bra size can I fit into a 34DD or a 32DDD/E? I know they are 'sister sizes' but how do I know which one fits me

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If I wear a 38C in bra size can I fit into a 34DD or a 32DDD/E? I know they are 'sister sizes' but how do I know which one fits me

Which bra is bigger 34D or 38C? - Quora

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What size of bra should I wear when my left fit in 34DD and my right fit in 34D? Should I pick 34DD or 34D? - Quora

Why are 34C and 32D sister sizes but 32D fits me well and 34C is too small? - Quora