OH, Lordy - can I ever relate to your comments, Tractor Seabee. No union suit here but many layers of the "new" stuff - polyesters, Gore-Tex, Polartec, micro-fleece & electrically heated undergarments. Plus an entire outer layer of Eddie Bauer with goose down. I do not like being cold when outside nor riding my motorcycle cold. And, I've learned to like the Pillsbury Dough Boy look, as long as I'm warm.
It was the "IN" thing or being "COOL" to be outside with only a T-shirt and sweat shirt when we lived in AK. I think I'm paying for all that foolishness now.
BTW - I though wool union suits were the "thing". Wool is both warm and ITCHY. Itchy to aide in blood circulation at the surface of the skin.
Whatever - it was a wool union suit, as a kid, where I learned of my allergies to wool. Brought an all new meaning to the word - scratch.