A trick that I have read in multiple place is to turn all of the hangers in your closet backward. Once you have worn and washed/dry cleaned an item put it back in the the hanger facing the proper direction. After each season donate any items that are not facing the proper direction. Obviously if you start this project now and own a heavy winter wool suit you do not have to get rid of it by the end of spring if it has not been worn, but if you have not worn it by the end of next winter, out it goes. Your wardrobe will be cut down immensely within one years time.
I've read that one too, but I use a slight variation; turning all the clothes hangers around to start is a steep 'start up cost.' (or at least seems inconvenient)
All of my clothes are on a single rail, pants on the right, shirts on the left. After I wear a set of clothes (guys don't have 'outfits'
), I put them in the middle, between the set that I would have worn yesterday. After a while, the clothes that I don't wear often work their way to the outer edges. It also makes it easy to tell how recently I wore something, so I avoid wearing the same thing to often, or two days in a row!