Remembered this one last night, and I probably really only have to post the punch line, but just in case...

Three women of the village were leaving the dance when they came upon one of the men lying in the ditch with his kilt over his head. The two older women both looked and said "Not my husband". Then the youngest lass comes up to look and says "Why he's not even from our village!"

Also from my tall kilt wearing friend.

What's worn under your kilt?

Nothing, lass. It's all in perfect working order!