#19 goes larger. I know because I own it in a larger size. It’s helpful to include back range and cup range separately. For example, I’m a 32GG. A lot of larger bras/swimsuits don’t fit me because a lot of manufacturers assume that women with larger breasts are also larger women. So it’s all well and good that a swimsuit goes up to size J and I’m sure that’s helpful info to some women, but if they don’t carry the smaller back sizes it’s just as useless to me. That said, Freya and Panache are both wonderful companies to buy bras and bathing suits from. They fit exceedingly well and offer a lot of support without looking like you raided your grandmother’s closet.