After hours of browsing the endless vintage racks at Cheap Jack's, I decided this gleaming halter dress by Roberta was worth a shot—until I tried it on. With its frayed hemline, too tight glittery charcoal fabric, and overly revealing neckline, the dress made me feel like a cheap—albeit high-tech— hooker. Lonely Star Trek fans might imagine women of the future in this dress; fashion-forward gals wouldn't. 303 Fifth Ave., at 31st St.; 212-777-9564.