Sister Sizing is an alternate bra size. Simular but not the same. 32c ,34b , 36a are Sister sizes.

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Sister Sizes: The Bra Secret Every Person Should Know – Sister

36A and 34B — they're both technically a B cup. They're called

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Bra Sister Sizes To The Rescue - Sisterhood Of Bras

Is 36C the same as 34D in bra size? - Quora

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Sister Sizes: The Bra Secret Every Person Should Know – Sister

Sister Sizing is an alternate bra size. Simular but not the same

Bra Sister Sizes To The Rescue - Sisterhood Of Bras