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Gia is six feet tall: The black tankini looked skimpy on her. And the band of color in the middle—which emphasized width rather than length—didn't help. The luscious one-piece picked for her was another story. "I love to show off my shoulders," Gia says, and a substantial halter neck does that more effectively than skinny straps. Vertically ribbed fabric and lower-cut legs help to elongate her torso. Nylon, Lycra and spandex ribbed one-piece, $56, Lands' End.