It's like clearing out the past. Get rid of the things that you don't like, that are worn out, too loose, scruffy and not in keeping with the new you. Keep anything that is just a bit too tight at the front of the wardrobe and try it on once a month.
I've done this twice since starting on SP and even after a couple of months there's more stuff to go. I've moved back into two blouses that have been too tight until recently. Now eyeing up a skirt