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No BB is not an actual cup size. Cup sizes vary depending on the country you are in as well as the company but usually follow the general formula of: "AA, A, B, C, D, DD/E, DDD/F, DDDD/G, H, I, J, K, L, M, N, etc.."

The reason for so many D's is because when the sizing system was developed, it did not cater for anything below an A or above a D.

Here in Australia, all sizes have a double equivalent except B and C. All the double sizes fit between their corresponding letter size and the next letter above with the exception of the AA being a smaller size than and A.

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12y ago

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