I just flew home from Fort St. John, BC and I was kilted the both way. I was wearing my 4 yard Bear Kilt. The 4 yarder is the best kilt to travel in. It has no metal buckles and I didn't need to wear a belt either. I didn't set off the alarm. After sitting on the seat for 2 hours, it was wrinkle free.

Really, What do you expect airport securities to think of your kilt anyway?