We bought ours at the local Dollar Tree, as they are just for Disney so we went cheap, and they are cheap.

We have both a sweater holder that velcros on the closet bar, and a shoe holder that has a hanger "head" on them - so not over the door, but they can be hung in the closet area. They fold up flat. It will work perfect for us since there are 4 slots on the sweater holder, so we can stuff one day's outfit for each person in each compartment. We are also using compression sacks for our clothes for extra luggage space - self-pressure "vacuuming" kind.
Target and
Walmart also sell the closet storage, for about $15 (?). Target has shoe holder storage that can be hung over the bathroom door.