I have a tower of hatboxes. This is just for the Historicals--I haven't figured out what to do with the Today girls yet.
Here's how I organized it:
1. Hair ribbons
2. Shoes
3. Accessories
4. Hats
5. Clothes (Felicity-Josefina)
6. Clothes (Addy-Molly)

It works pretty well and they are very pretty. No one would ever know I was storing doll stuff in there...