All of my costumes go in the loft unless they're needed sometime soon or ones that I wear regularly, like Sasuke. Wigs all stay in a draw under my bed as I use them casually as well.
I HATE parting with costumes considering the time and effort I put into them. However, I have managed to loose one and my first Poison Ivy I just threw away because it was pretty bad, but all my others are in the loft x3