What an amazing observation Jimmy - that makes perfect sense. An underkilt would help keep the wind from getting underneath the kilt and flaring the pleats apart. Maybe there are some physics instructors who could verify that effect....?

I used to wear tartan boxers under my kilts at work. Then one day my supervisor said a client complained they could see my underwear. Which cracked me up in view of how young gang banger wannabes wear their underwear showing above their droopy drawers. So, I switched to black undies at work.

But dang, I think Jimmy's hit on the second best reason of all to don an underkilt of some sort.....Marilyn Monroe effect reduction. Likely deserves a thread of its own.

And I still don't understand why kilt suppliers and kilt rental agencies don't offer/supply underkilts as a matter of course. Seems like a natural add on sale.