Also, funny story. Wore my kilt to a buddy's wedding in Chicago, afterwards we walked to Millennium Park to do photos and then lunch at the restaurant attached to the new wing of the Art Institute. To get to the restaurant you have to go up a foot bridge, and there's a security guard there. He made my buddy drink and throw away his water bottle for 'safety reasons.' I walked right past. As soon as we got in the restaurant, my buddy said, "Dude, he made me throw away a bottle of water but he let you just waltz right in with a friggin' knife in your sock and a flask of whisky in your sporran!"
Speaking of security theater, every time I go through an airport with my kilt (well, just the once actually) I pack it carry-on. Only time I took it with me, the TSA guy going through my luggage pulls my stuff aside for secondary screening, as soon as he sees the kilt and sporran he says, "hey, nice kilt!" And that's it, off to the gate. Again with liquor and sgian dubh.