Sitting on the ground in a kilt? LOL!

[Katia]

I'd sit with legs stretched out, as you said, or even cross-legged with the apron of the kilt well tucked down. You could also sit on your knees, meditation-style, or with your legs bent up and tucked behind you.

Really, the only position I wouldn't recommend is sitting with your feet flat and knees bent up, but technically you could even manage that by tucking the kilt down between your legs, if you didn't mind your knees and thighs being naked (it might look funny...).

I always laugh at these questions, but I guess it's not something most men have known how to do practically since before they remember being taught/figuring out the logistics...