Model wearing red one-pice swimsuit with keyhole neckline
Credit: Robert Maxwell

To streamline your lower half, keep the lower half of your suit streamlined, too. Skip belts, ring details, and high- or low-cut leg openings—the ideal cut is about an inch below the hip bone. You can be more daring up top, like with this halter with a keyhole neckline.

To buy: Splendid Swimwear one-piece, $58,

For more of the season’s best swimsuit picks, see The Best Bathing Suits for All Body Types.