I gotta know Eric - do you wear kilts?
Kilts are bare gowns that don't need anything underneath them, not even underwear. We can state that every style of Scottish kilt comes with a ventilation system. The primary advantage of wearing an "open dress" is that it never causes sweating or itching. That said If you find your kilt itchy, try wearing a pair of bike shorts underneath. It's mostly on the thigh fronts that people get itchy
As a Scot, if its your own kilt that no one else will wear, go commando 😉 always