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 a peer-to-peer clothing exchange that lets you trade items with other people who also want to clean out their closets.When you sign up you answer a series of questions (do you live in the city or suburbs? how large is your closet?) that determine how much you have in the way of unwanted clothing and what the "value" of your closet is. From there you add the items you want to trade to your virtual closet, listing the size, brand, color and condition. Then you tell them what you're looking for, again specifying brands and sizes. The system uses an algorithm to match your preferences with other users. Once a swap is engaged you send your items using pre-paid envelopes (they come in packets of three for $25; the service is otherwise free). If you feel a little odd about taking somebody else's used clothing, rest assured that threUP claims most of their users only trade new or "like new" items.  In addition there's rating system that helps maintain quality control (it also allows the system to find good matches for you).