I don't find sitting in a kilt to be any less comfortable than sitting in trousers. I've gotten so used to the "butt sweep" that I don't even think about it anymore. If my hands are full, I just lean forward a little, give the kilt a little swing to the front, and then sit down before it has a chance to swing back again - works like a charm. As for wrinkles, I always get a little bit of a crease down the pleats on the left side of my kilts for some reason - but they fall back into place on their own in a few minutes. If I'm wearing my UK I don't even care about wrinkles - I don't think those pleats will even iron into place anymore; they're a lost cause.

Andrew.