Bridgedale winter wool hiking socks under Gaerne Inka shoes fitted slightly too big for the extra sock space. Castelli Diluvio overshoes.
Secret weapon though is probably this Craft Warm Mockneck which in appearance harks back to the HTC days
Not my feet but helps with the core.
When I was a poor kid with overshoes that never helped much, I used to fit small plastic bags around my feet and that helped a lot.
bad days, best selection of all is a turbo session.