I'd like to also support the Sock Dreams idea. I occasionally wear socks and boots similar to Howie Nicholsby's style. I find that some of Sock Dreams' leg warmers work well for this look: I usually put on a pair of moisture-wicking low socks on first, followed by the leg warmers (usually dark coloured) followed by another pair of socks (that I've cut the foot off). Breathable and functional and if it gets chilly enough, I can always pull up the leg warmers so they cover more skin.

But, similar to some other posters, if the weather is too cold for bare knees, then I may not wear a kilt. Other times, I will wear long merino wool leggings.

Best,
Jonathan