My usual response is, "Wearing a kilt is really about freedom. You are free to wear whatever you like under it.. or nothing, if you wish." If I don't want to get into what I am wearing (or not wearing) under my kilt, I add, "It's really nobody else's business what you wear under your clothes anyhow, it is a personal choice."

In truth, except for a few rare circumstances, I don't know why anyone would wear underwear under their kilt, as it seems to defeat the purpose. But, I have worn loose boxers or lycra shorts on occasion, like when I was going to be around small children or riding my motorcycle.

I respect everyone's personal choices and privacy. I can't imagine asking someone what they have on under their kilt, dress, skirt or pants or blouse, but people don't seem to have any inhibitions about asking you when you are in a kilt. It is like asking someone what their favorite sexual position is. In the right setting, it may be appropriate. But rarely.

I try not to get upset, regardless of how rude they may be in asking, but it is hard not to get perturbed when I answer their question with the same question and they get upset at me for prying!