The event you are wearing your kilt for, if there is an event, should greatly affect whether or not you'll be wearing undergarments. Out here in Arizona it get's extremely hot, 116 degrees today, and the less we wear the better in my opinion out here.

We had a kilted kickball tournament (you can see pictures in the kilt nights forums) back in March/April, and we knew that there were going to be children out there, so we all wore our underwear that day. Children are by far the number 1 reason to wear underwear, but following closely behind in number 2 reason is, because you want to.

Although the ladies do love it when we go regimental.