Dunn says this decade is a "swimsuit free-for-all." By this age, women are more comfortable in their own skin, so it all depends on how you feel. "A woman might wear an itsy bitsy bikini she's had since her 20s, and look just as great now as she did then, or sport a covered up look at the pool or beach and look equally as stunning," says Dunn.

Look For: Quality, well-made suits, flattering necklines and skirted bottoms if you're worried about problem areas.

Consider this chic one-piece your LBD in poolside form. With sexy peeks of skin and supportive underwire cups, this suit is guaranteed to turn heads.

Shop it: Agent Provocateur Marnee Belted Swimsuit, $790

The bandeau gets a sophisticated upgrade with a front zipper and a chic, skirted bottom.

Shop it: Michael Kors Tunisia Front Zip Bandea and Skirted Bottom, $152

This sophisticated floral bikini top is designed like an underwire bra for comfort and support, and comes with wide bottoms with delicate lace detailing.

Shop it: Zimmermann Keeper Underwire Bikini, $250

Channel your inner Bond girl with a black, belted halter top and bottoms with matching buckles.

Shop it: Michael Kors Belted Halter Bikini, $340