Last April I flew to San Francisco and back for a wedding and was kilted both times. On the flight from DC to San Franciso didn't have a problem at all.

But when I went through security at San Francisco the guy started to give me a hard time about my sword shaped kilt pin. Now, he was having to do a special search on me anyway because I was in a wheel chair (the distances in an airport are just too much for my bad leg to handle) and he'd already patted down my kilt and had to help me with my leg. So he starts to ponder outloud if someone might mistake my kilt pin for a weapon or if it would be possible for me to threaten someone with it. Thankfully a supervisor was in earshot when I said "You really think a cripple who can't walk on his own is going to try something on a plane? I can't even get to the bathroom without help from the stewardess." The supervisor walked over, saw the tiny kilt pin and my shriveled up bad leg and told the screener to send me through and stop bothering me. Her rational was that the kilt pin was (a) jewelry and (b) too short anyway.