Not sure I understand what you are asking?
What? Smaller than a hanger? Just put in shelves for folded clothes.
I live in an old house so I have a few closets like that. A regular hanger just barely fits front to back. In the olden days they just hung their few clothes on hooks on the back wall. I agree shelving is the best way to make use of the space. I use mine for shoes too. You can hang straight skirts and pants they don't take as much room as blouses and shirts,
I would use it for shoes and folded clothing.
Use soda can tabs to cascade the hangers. Huggable hangers are a great item for tight areas. Try adding a second rod if you just use it for shirts and pants.