NetNet a porter.com This high end e retailer displays its offerings of clothes, lingerie, shoes, and accessories like an interactive magazine. You can check out hot off the runway styles from designers such as Alexander McQueen and Rick Owens, then buy them. Look for exclusive pieces from Burberry and Christian Louboutin this fall, and sign up for Fashion News, a weekly e mail with the scoop on recent arrivals.

Although it s growing, the selection on these sites pales next to that of even a modest department store, and flash sale sites can leave customers frustrated when supplies run out. Most maintain calendars or blogs that give users a week or so of advance notice, but that hasn t always helped Suzanne Hupy, a former retail executive in Milwaukee. She says she s logged on to Gilt.com to buy clothes for herself and her kids only to find the items sold out sometimes less than a minute after the announced launch. When it s gone, it s gone, she laments. She and other shoppers also point out another drawback in the flash sale model There s often a much shorter time limit on returns than they d see at a traditional retailer in one case, as little as five days after purchase.

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