clothes that don't fit, aren't comfortable, or aren't flattering
I keep a box beside my dryer. Every time I wear something, I pay attention and ask my self - does this fit, is it comfortable, is it flattering. If the item fails one of the tests, as soon as it comes out of the dryer, it goes in the box. When the box is full, it goes to Goodwill.
I just put in 2 skirts this week. They fit and are comfortable, but I caught a gimpse of myself in the front door of the building where I work while walking in wearing one. OMG what I thought was flattering makes my be-hind look H-U-G-E!!! Since I had 2 of the same skirt in different patterns, I put them both in!
This really helps cut down on closet clutter. I can now keep 4 seasons of clothes in a 4' closet. Actually I only have 2 seasons, with some light sweaters for in-betweens like Spring and Fall, but it all fits.