Even then I was sat down and told that a client complained she could see my tartan boxer shorts under my kilt. Right...okay fine....never mind the current fashion of showing boxer shorts above low slung pants....and what was she doing looking there?
That example seems to bear out something I said in another thread a while back: if you get into a position where someone can see that far up your kilt, it's not that huge of a difference whether you're wearing anything or not. They're going to be offended either way. Granted, their level of offense will be higher if they see chicken-skin versus underwear, but still... the point is that they saw something they shouldn't have seen.

So it really begs the question, not of whether something should be worn under the kilt, but whether the kilt should be worn at all in that environment.