If you need fashionable swimwear in any dress sizes up to 32, then you are no longer restricted to swimdresses. Some merchants also offer a choice of lengths of swimsuit to match the length of your torso. Now you can look confident on the beach. It's still hard to find anything larger than a 32, in the UK, but they are moving in the right direction.
Halter-neck designs can be good if your shoulders are not particularly broad, and/or your bust is ample. Cross-over designs of swimsuit look great on an hour-glass shape. Vertical panelled design is traditional for a slimmer look, if you need that boost in confidence, although plain dark colours are usually best if you don't want to be the centre of attention. A break in the colour design just below the bust, can help if you are apple shaped, of similar is size for all 3 vital statistics. These styles can draw attention more to the bust, away from one's tummy. Pretty prints can also obscure any bulges.