You may be doing this periodically throughout the year already, but spend a weekend this spring fully going through your clothes. If you find something you haven't worn in a year, try to make an outfit with it that very week -- if it doesn't happen, it wasn't meant to be, and to Goodwill it goes. More than just your closet, though, go through your drawers! Toss all the socks that have holes and rediscover some of your favorite T-shirts. Pull out whatever treasures have been shoved to the back and get stuck on the drawer above and figure out if the organization structure you have going is the best.