Some of my favorite travel pants are slacks made from a blend of rayon/nylon/spandex. They are very comfortable for long haul flights, sightseeing and nice enough for dinner just about anywhere.
Was in Costco today and they have a new batch from Hilary Radley in navy, black and dark green. Currently $4 off so $15 a pair on the website and $13 at the store. The pintuck is a very narrow seam up the front of the pants that looks like a crease as if you ironed them (haha).