Wardrobe rules

Skirt: vintage; Shirt: Old Navy; Belt: Urban Outfitters; Shoes: Go Jane Earrings: Mod Cloth

This skirt was purchased in January right before the 30 for 30.  Though I think this skirt is really better suited for the fall, I thought I'd get one wear out of it before spring arrives.  I have a rule I adhere to pretty strictly, that if I haven't worn something in the past season, that it has to get swapped, sold or given away.  There are some items in my closet that I will never part with, but for most items, if I don't wear it in a season, it makes no sense to have it taking up space in my closet.  I'm going to work on being smarter about what I add and subtract from my closet in the future.  From a fiscal standpoint it makes more sense for my spending habits to mature as I am growing older anyway. I don't want to be the little old lady that lived in the shoe because I chose to purchase clothing over saving my money.

Do you have any similar rules for how you make sure you are wearing all of the items you own?