My Frugal Corner pleats are immortal, never wrinkle at all.
My Stillwater Thrifty Standard will wrinkle a bit but hangs out.
Same for Utilikilts.
My more expensive ones wrinkle a bit, but, all hang out after a day or two.
Have never needed to steam them.
I have no wool kilts - dry cleaning is not in my vocabulary.

But my Amerikilt curls AND wrinkles - even if you don't wear it! I rarely wear it, as i'll have to wash it, then it takes forever dealing with the pleats!