As a school bus driver, I find that most mornings I need a little bit of extra warmth on the bus.  The heaters on those things are horrible; they take over 45 minutes to warm up, and they only start to warm up after you are actually driving.  Being diesel, they need to be driven to warm up.  So, I need to really bundle up in the morning to keep from freezing to death!

I like to wear Tights under my thermal underwear and jeans to give me an extra layer of warmth without a lot of extra bulk under my clothes.  I buy them over the Internet at www.hue.com.  They have a good selection of tights and socks, and their prices are fair.  I like to buy the opaque tights with feet in them, to help keep my feet warm, too!