I flew cross country in my USA Kilts casuals and had no problems at all. Of course, I wore my boots and no kilt pin and my shirts were polo style. No problems with the pleats and, as on seat-mate observed, I was "probably the most comfortable man one the plane". I will probably fly in my casuals from now on. I did have to remove my boots, but everyone had to take their shoes off. My son-in-law wore his kilt with kilt pin when the kids left for their honeymoon and had no problems either.