Hanging storage is something that I've experimented with in a variety of different spaces. I've really come to love the use of tension rods set into bookcases. They're easy to set up, functional, customizable, and easy to take with me into a new room or space. They are available in a variety of rod widths and lengths. Be sure to measure the width of your bookcase to find the best fitting rod. You'll also want to make sure your hangers will hang and slide comfortable on the rod.
Another hanging system I recently came across at Ikea called Elvarli, is quickly becomming a new favorite! It's easy to set up, stores a lot of clothes, and is also customizable. I have the basic set with just two posts and several hanging "clothes rails". The rod on this one is a bit wider so it only works with my 18" doll hangers - both plastic and wooden, but not the ones that come from American Girl or the smaller plastic hangers for 14" doll clothes.
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