Charities like Goodwill sell or give away some of the used clothes they get. But a lot of the clothes get sold, packed in bales and sent across the ocean in a container ship. The U.S. exports over a billion pounds of used clothing every year — and much of that winds up in used clothing markets in sub-Saharan Africa. On today’s show, we visit a giant used-clothing market in Nairobi, Kenya to see what happens to American clothes (including, presumably, some Planet Money T-shirts) after Americans are done with them.