I used to keep mine on hangers, until I bought one to Mr. MacDonald for some work... he had a few words to say about using skirt hangers from Ikea...

I just recently moved all of mine to a big sealed plastic bin with the rest of my gear. I was having issues with the middle pleats being a bit messed up from hanging. After rolling them up, the problem is gone. Also makes them more compact, and easier to store.

I also prefer the scent of cedar to both lavender, and mothballs. More manly to boot!