Like Nighthawk said, a 16oz wool fabric will pretty much pull all but the worst crumpling out by itself. While I don't have one in any kind of tartan(yet), box pleats seem to be the easiest to lay flat under the backside in my experience, but that is mostly because they tend to be much wider than knife pleats and Kingussie pleats. As far as comfort while seated goes, I can't say that I see much difference between any pleating types. They all beat p@nts though!