Wool underwear

Back when I was in a frenzy buying wool sweaters to make longies for the wee one I picked up a sweater at a thrift store. Not just a wool sweater, a wonderful, soft, thin wool sweater. It was missing its tags but I'm optimistically positive it is Smartwool. I originally thought it would make a nice pair of summer longies, but hesitated and then discovered the little one is a naturalist in the summer. Well, she's probably a naturalist the rest of the year, too, but we keep her covered up.
Back to this wool I need to use... underwear, grownup underwear. It gets cold in our house in the winter. Wool is supposed to make great underwear, requiring less washings than regular cotton (umm, we'll see about that part, I'm a bit skeptical of the idea of rotating unwashed underwear). So off google to find directions for turning a wool sweater into underwear.
Perhaps my problem was using the term underwear instead of panties. Anyone else have an issue with 'panties'? I never liked that word. Anyhow, I found this post: Any Size Long Johns from Wool Sweaters Now that's an idea. A few odd seams in a pair of long johns won't matter if no one's going to see them anyway. And it combines another project I've been contemplating - something warm for under skirts in winter. Flannel bloomers had been the direction I was going, but wool long johns sounds even cozier... Now to find out if my sweater can cover more than just my butt.