Yhmxh Adjustable Shelf Organizer Expandable Closet Shelf and Rod with No Drilling Heavy-Duty Tension Shelf Adjustable Locker Shelf Cabinet for Wardrobe Cupboard Kitchen 15.35" to 21.65"

If the dresser isn't working out for you, what do you think of something like tension rods with something like foam board or a wooden board on top to create shelves? That way, you can put them at whatever height you need, and then you can put bins for your son to put his clothes in or just have him fold them on the shelves themselves. If that rod is too high, you could also put a tension rod lower so he can reach it easier, if you want him to be able to hang up shirts or pick his shirt for the day. This won't be long enough, but something like this that you either buy or make with tension rods and a flat surface: https://www.walmart.com/ip/Yhmxh-Adjustable-Shelf-Organizer-Expandable-Closet-Shelf-Rod-Drilling-Heavy-Duty-Tension-Shelf-Adjustable-Locker-Shelf-Cabinet-Wardrobe-Cupboard-Kitc/19317117646?classType=VARIANT&athbdg=L1400&from=/search