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"The back is the new hot zone," Glassman says. Clothes with cutouts and alluringly low dips spotlight an often overlooked area. This minidress (Hervé Léger by Max Azria, $1,350) is made of superstretchy fabric that holds you in and smooths you out. Trying before buying is mandatory with styles like this one; if a bra is needed, get one that works with open backs, like Le Mystère's Dos Nu Convertible Bra ($64).