The shop where I take my things decides what it wants, and then tries to sell it. If they sell it, I get a percentage of whatever they sold it for (don't the the exact percentage, though). If they don't sell it, I get it back.
Check out a couple of shops before you decide on which one to try and sell your clothes through. Some places will try to rip you off and others will hardly even try to sell your clothes.
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