I saw someone with longjohns under their kilt a the ren faire last weekend. That look is not for me. Of course, my knee high boots and the length of the kilt work well. I've noticed that my PV from Rocky is much warmer (cooler in the summer for that matter) than my Amerikilt, so I suspect that an 8 yard wool would be toasty. While the long johns were obviously functional, I didn't like the look and my boots kept me warm enough.