You can sell used clothes at flea markets, yard sales, or even place an ad in the newspapers. Flea markets charge a small fee, so if you don t want to pay have a yard sale. Craigslist and ebay sell clothes also.
Your best bet would probably be to look up your location in a flea market directory and find a venue close by that deals with used goods. I ve sold lots of gently used clothes on Ebay and made money as well.Best of luck to you!