I ran a 5 miler back in December in a kilt in Baltimore (Celtic Solstice run in Druids Park) and there were no problems. I had my ususal running shorts on underneath. I've never run in it during the summer - that's triathlon season. There was a group of spectators (mixed gender) that would bow and genuflect whenever a 'kilt' ran by. It also garnered the attention of some of the fairer sex who were also running.

Happy running!

Toronto Jerry