We use hanging cloth shelves and put all our foldable clothes (t-shirts, socks, unders, shorts, etc) in them. One shelf even has a drawer in it for small stuff. We don't actually take any "dress-up type" clothing that needs to be hung up. Our jackets get hung on clothes hooks we've installed by the entry door.
Since the back of the cabinets follow the shape of the front of the travel trailer, they are deeper at the bottom and more narrow at the top. We utilize that space by storing items that we don't use very often in that extra space behind the hanging cloth shelves.