I don't have much cycle specific clothing. helmet, J&G rain jacket, dork bands and rain cape are pretty much my cycle specific clothing.
I agree with the general gist of the conversation here---wool, layers.
The hardest part is trying to keep the 3 F's (face, feet, fingers) warm.
I use snowmobiling gloves and mittens for the fingers.
Wool socks with waterproof work boots seem to work for my feet.
I use balaclavas, 180's (ear muffs) face masks in various combinations for my face

It is surprising how little clothing you really need to ride in the winter. I have done my commute at -20 F dressed as described.