Why do bra sizes go from D, DD, to DDD instead of just going from

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Why does the band size fit 34 but the cup size is small DD? - Quora

How big is a 32DDD big bra size when compared with some object? - Quora

Why do bra sizes go from D, DD, to DDD instead of just going from D, E, to F? - Quora

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What size bra is one up after 42DD? - Quora

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What is the difference between a DD bra size and a DDD bra size in the United States? - Quora