What sizes do you have? / I don't know my bra size.
"Our clothing size range includes XS, S, M, L, and XL. For our lingerie, we have implemented shared sizes as follows: XS-S, S-M, M-L, and L-XL, with the aim of making it easier to determine your size. This means that bra size groups are related by cup volume and can fall within shared sizes as follows: XS-S: 30B, 32A S-M: 30C, 32B, 34A M-L: 30D, 32C, 34B, 36A L-XL: 32D, 34C, 36B, 38A."