Question: what do bra sizes go by?
Answer: For example, if you're current bra is a 34C and your underbust (see Step 1, above) measures 31 inches, then you probably need a 32D. On a 30-inch band, this would be a 30DD. And remember: In the U.K., cup sizes are AA, A, B, C, D, DD, E, F, FF, G, GG, H, HH, J, JJ, K, KK.