I haven't tried these myself, but I found these on Amazon with decent reviews:

17" long; Fits over interior doors up to 1.5":

mDesign Metal Modern Over The Door Long Easy Reach Storage Organizer Rack - Hang Coats, Hoodies, Hats, Scarves, Purses, Leashes, Towels, Robes, Clothing - 17" Tall, 4 Hooks - 2 Pack - Graphite Gray

24" long; Fits over interior doors up to 1.5":

mDesign Modern Metal Long, Easy Reach Over-The-Door 4 Prong Hanging Storage Organizer Hook to Hang Jackets, Coats, Robes, Clothing, Hats, Scarves, Purses, Leashes, Towels, 24" Tall, 2 Pack - Chrome