I rounded up some of my favorite size-inclusive one piece swimsuits, as well as a couple I have my eye on. Generally speaking, I always size up one in swimwear due to my longer torso. I left my suggestions below!
Ruched Bandeau One Piece: One of my favorites, this strapless suit has built-in support ranging from D-cups to DD-cups. The ruching is very flattering as well, I find that for a strapless suit, even if you opt out of the cups, is very stable and comfortable! Size up one.
Tummy Control Chlorine Resistant Scoop Neck: A tried and true go-to! This one piece has fantastic support in the chest. It comes with soft bra cups, and you can select DD or D cups if needed. You can also opt in or out of the tummy control, but I have and love it! Size up one.
Gingham Halter One Piece: I have fallen in love with the Draper James swim collection for Lands’ End that benefits Girls Inc! Halters are a great option for large chests. Size up one, possibly two if longer torso.
Pattern Mix Tie Backflip Suit: Tanya Taylor came out with a great size-inclusive line of swimwear. This one piece ties at each shoulder, so you can adjust the support as needed. The v-neck is so flattering on everyone, too!
High Neck Tie Waist Suit: I love this suit so much! It is an understated statement, and Summersalt suits are fantastic for curves. Summersalt generally runs true to size. The reviews on this say the same.
Those are great bathing suits. All of them!