A piece of clothing that does not get enough press is a facemask. A little wind in the below zero temps can really put a hurt on your face. Also, fur hats are the best for the coldest temps. I find they are really too warm most of the time and they also muffle a lot of sound when the ear flaps are down.

'Often mistaken, never in doubt'

'Ignorance more frequently begets confidence than does knowledge' Darwin