I have lived in Texas most of the last 31 years. THIS year I bought some of these; silk long underwear. I'm telling you, I have never felt like I needed long underwear here, but I wear them EVERYDAY! They are so comfortable and just add a little bit of warmth right were you need it; under your jeans. I just ordered another pair of bottoms, the tops show a bit under some shirts so I usually skip wearing the top and wear one of my red jackets.
And why am I mentioning this at the end of winter? I am sitting here shivering since I thought it would be warm enough to just wear my jeans...wishing I hadn't put both bottoms in the washing machine.