Answer (1 of 5): I think cup volume is not proportionate from D cup in any band size. Normally cup size is function of band size, which is over ruled from D cup onwards. So to indicate the very fact D, DD and DDD sizes are introduced, where cup volume will be not exactly increased by 1 inch more
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YSK that “DD” breasts aren't as big as you think they are, and without the band size you could be referencing anything from kiwis to cantaloupes. : r/YouShouldKnow
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