Right... Before this lapses in to a weird version of scots I would advise doing wha I know my best man will.

He is going to look at me and say "just in case we needed proof of who wears the pants" and leave it at that.

By all means use the kilt as a premise for a joke but don't ridicule the kilt. The difference is between insulting one person or many.

Another could be to take your joke and aim it at someone in particular. "I was worried about wearing the kilt because knowing me I'd make it look like a skirt. Now that I know a can wear a knife legally with I don't care what I look like." or something like that.

Good luck. I'm sure you'll go down a treat

Rob