When your closet starts getting overcrowded, take all the hangers with your clothes and put them in backwards. If you use a garment, you can reverse the hanger. After a month pull all the clothes that are still hung backwards and remove them -- you're not wearing them and they just take up space!
You can put them into a temporary "hold" area but if you still haven't worn them give them to Goodwill or your favorite charity. That leaves space for all the new "thinner you" clothes you'll need to get!