I usually drive the Westfield in sub 30F weather several times each year, but to be fair, those are generally only 20 minute trips to the office. My wind deflectors do a good job of eliminating drafts from the lower part of the cockpit, so jeans, normal socks, and Speedcats are fine. To keep my head and torso warm, I wear baseball hat, ski jacket with the hood up, and zip up the collar so it covers my mouth. Works great. For my hands I have a pair of wind resistant insulated gloves that unfortunately only work well until the upper 30’s, so definitely the weak link in my setup. I think electric motorcycle gloves are probably the way to go for longer trips.
-John