Selling or trading your clothes makes perfect sense if you want to re-coup some of the money that you have spent to maintain your wardrobe.
You might have clothes that were gifts and never worn, or clothes that you bought and then quickly discovered that they made you look terrible.
You hate the idea of just giving it all away.
While many charities survive on the generous donations of clothes that are given to their thrift shops don't feel that you have no other options to get rid of your good quality clothes that you no longer need. You can make some cash from your closet.