Every January turn all of the hangers in your closet backwards, like this. It takes about 60 seconds: Each time you wear an item, hang it back up in the normal fashion, which takes zero effort to remember or do. In June, any item that is still hanging backwards has not been worn in 6 months, donate it to Goodwill unless you can come up with a good reason to save it.
Brilliant idea doing this right now. Turn all the hangers in your closet backwards, whenever you wear something, replace the hanger the right way. In a year, give away every piece if clothing still hanging on a backwards hanger. - Top 58 Most Creative Home-Organizing Ideas and DIY Projects