I've found keeping my inventory sorted and manageable much easier to do after purchasing a wardrobe system. It was a lot of work to set up, and it took some time to learn how it worked, but having an instant visual really helped. There are a lot of great suggestions here already, some of which I've used myself (such as having a "To Be Sorted" folder).
Organization and consistency are key. You can rename clothing folders, but you should decide on a naming convention before getting too far into things. Before my inventory got too big, I had clothing folders named according to description, vendor, name, and colour and then sorted into tops, bottoms, outfits, and dresses AND THEN in folders according to type of wear (i.e., casual, business, dress, evening, formal, etc.) Lately, I've been re-renaming all my clothing folders to just the vendor name and product name, to coincide how items are named in my wardrobe system.