There are certain clothes that just don't seem to want to hang on wooden clothes hangers, but if you don't want to replace every hanger in your closet, here's a simple tape wrapping trick to keep clothes from falling.
Use hockey tape, or any thick tape will do the trick. The wrapping method creates a makeshift shelf and keeps clothes from sliding off. You'll want to use some tape with a texture, to get the best grip! If you happen to have an abundance of vests, big sweaters or v-necks, this should keep them from finding their way to the floor.