Promising review: "I am a MtF trans-girl. I'm very flat chested, pretty muscular. The swimsuit fits ALMOST perfectly, my torso is slightly too tall. In order to make sure it pulls up as desired, I have the straps form an X along my back. The straps are adjustable, but this works better. I like the product enough I'll probably buy two, so I have a backup. For people who are pre-op, it can contain everything very nicely. I'm fully comfortable with this. But I specifically bought this because it fit my personal tastes, and I know I can still wear it with swim trucks without ruining the look." —Remrie Arrie
Get it from Amazon for $14.99 (available in sizes 2–16 and 15 colors).