To HOLD garb

[DonaCatalina]

My personal favorite....a groove to hold straps and clips for skirts and pants.
I bought a 100 piece lot off ebay and haven't quite filled them all yet.

[Rowan MacD]

Ditto on the kilt hangers, I have some of these from Stillwater Kilts; http://stores.channeladvisor.com/Stillwater-Kilts/Items/swk-ukh-setc?&caSKU=swk-ukh-setc&caTitle=SWK%20Ultimate%20Kilt%20Hanger
They hold up 6 or 7 pounds of kilt with no problems.

Yep, the wooden toggle type hangers are the way to go. However, Like Lady Olmstead has mentioned, heavier dresses and skirts should be stored flat since the weight of the fabric could damage or stretch the shoulders or waist band of the garment if left for very long. 
   I take out the dress/skirt a week or two before use and hang it up to let the creases fall out.
For the heavy cotton skirts (like Sofi's Stitches) I use the wooden kilt hangers year round.  I found mine at Target.   Walmart rarely has anything like this, almost everything they carry is plastic.