We all know to avoid the fast fashion habitrail of buying a five-dollar t-shirt because it was on sale, only to have it sit at the back of your closet for decades. And now that so many people are jumping on the Konmari bandwagon—finding joy, everyone?—there’s a lot of closet clean out going on. But what do you do with those clothes you’ve rejected? People, listen up: Here’s how to sell used clothes.