A very simple solution to this problem is to get a 8 yard Bear Kilt. With both my 8 yards(12 yard) from Bear, I have no problems what so ever with pleats and sitting on them. Even if I don't swish before seating myself, all I have to do is stand up and give myself a little shake, and then walk away knowing that the pleats are right where they should be.
Ok that is my .02 cents
Cheers