At the new Rebecca Minkoff store in San Francisco, the mirrors come alive. Walk into the fitting room with, say, a blouse and a jacket, and the dark glass lights up with a suggested handbag to match. You can browse the racks at the upscale fashion boutique or swipe through "looks" on massive touchscreens. If you see something you like, you tap in your phone number, and you'll get a text when it …
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