LAYERS!

Let me say it again.

LAYERS!

And remember basic thermodynamics of the human body. If the feet are kept warm, the head is kept covered, and the human abdominal core is kept stable, everything else will feel toasty enough.

This means good socks, or even wool leggings like the Black Watch wore. Good boots to keep the winter with it's cold and wet out. A good heavy kilt. Made of wool or like material, or one of those nice lined kilts from Pittsburg Kilts. A good hat. I don't mean a ball cap either. Something thick and wool. And keep layers around your middle. I can promise you that you will feel warmer than you ever did wearing troosers. Kilts work like mittens vs gloves. Your hands stay warmer in mittens than they do in gloves for all kinds of reasons.

Also, for very wet wintery days, invest in a good duster or trench coat. You will not regret it.