When you switch out your summer and winter clothese in your closet put the hangers on backwards. When you wear that item of clothing turn the hanger around the right way. That way you know what you have worn. At the end of the season get rid of anything that is still hung the wrong way.
I believe that each time we change our summer/winter clothese we need to reasses how they fit, their condition, and how much we still like them. No need to store clothes that we are never going to wear again. Go on...give it a try!