The two-piece turned 60 last year, and Miuccia Prada’s reinvention of the bathing beauty is turning heads for spring. This nautical (three-piece!) poplin swimsuit by Prada (www.barneys.com; bikini, $390; shorts, $415) comes in three patterns and fits neatly into its own matching tote. Sport the bikini poolside, then slip on the shorts for a beachfront stroll. So long, sarong.