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In October 1932, the S.H. Camp and Company correlated breast size and the degree they sag to letters of the alphabet, A, B, C, and D. Camp's advertising featured letter-labelled profiles of breasts in the February 1933 issue of Corset and Underwear Review.

These procedures were only designed to help women with the then-standard sizes A through D up to a size 38 band size and were not intended to be used for larger-breasted women. In 1937, Warner began to feature cup sizing in its products.

Other companies like the Model and Fay-Miss (renamed in 1935 as the Bali Brassiere Company) also began to offer A, B, C and D cups in the late 1930s.

The '30' you ask about represents measurement from around the torso and the 'A' to which you allude represents the size of the breast. (A being small, leading up to D being voluminous)

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12y ago

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