Choosing the right swimwear when you are full-figured and busty is tough. It's important to have the best support possible. The best option is to purchase a suit with a built-in bra for added support. A halter style will help give you lift, but you need to be sure that you aren't bulging out of the side of the suit. A one-piece suit is best for this body type to really get the support needed to accommodate a large bust. That being said --- you can still be stylish.
Choose a funky print with a v-neck style to show off a little sexy cleavage. Dark is most slimming, but let's face it, it's far more fun to get into something colorful that plays up your wonderful curvy body. Who wants to be drab all the time? It's much more fun to parlay on the beach in fun, tropical colors that showcase the fun personality you possess.