When we were cleaning out our garage, we came across an old wall hook/shelf and it suddenly occurred to us to just hang it on the inside door of our hallway closet, at our son's height. Can we just say, "Duh!" Not only does it keep tiny jackets off of chairs and floors, but it also encourages more independence and self-esteem in the kid. It's a win-win situation.
While our shelf was an old classroom hand-me-down, we think these shelves and hooks would work as well: