Selling clothes?

Random picture of Boston that has nothing to do with this post... isn't it pretty though?

I'm thinking about selling some of my unwanted clothes online, on Tumblr or something. Maybe I could donate some money to a charity? I just feel like I get rid of clothes a lot and donate them, not really knowing where they're going. I'd rather give money to a homeless shelter, you know?

Have any of you done that before? I kind of want to give it a go. I already have a Tumblr set up and ready to go, I just need to take pictures of the clothes.

Just putting all that out there for feedback! Thanks loves!