You have to be quite slim both in the body and the breasts to wear the S/M. As for the larger size, I guess if you normally find Medium fits, it should work for you.

If you don't want to pay more than $25 for a longline bustier, then this item is a-ok. If you can shell out for a more expensive, higher quality product, I highly recommend doing that instead. It's better seen than actually used.

Fantasy Lingerie promised alot with this set, and they just didn't deliver. I expected a satiny finish on this beautiful design, but got cheap, tacky mesh instead. The bra was unflattering and didn't support my breasts, and the thong was unreasonably uncomfortable. A big fail.