I’ve never thought wool was scratchy. I don’t understand why people always say that.
Silk is warmer than wool? really? I will have to try that some time.
For the ultimate in warmth and comfort during cold Chicago winters I go with a layer of silk next to my skin followed by a quality 100% wool suit. The only cotton is the shirt. Put a wool sweater on underneath the suit jacket and you’re good to go till well below freezing.
When it gets really cold the long black wool overcoat tops this off. It’s like wearing your blankets. LOL
Silk is actually the warmest fiber, by weight, or so I’ve been told.