For the coldest days here. It's Texas so keep that in mind. I love to hunt the 20 degree days, but just like you we have a bitter cold that goes right down to the bone from the humidity.
I wear a Silk or Underarmour style long sleeve shirt, then a 100% wool sweater,a berber pullover from cabelas, and my wooltamite vest with windstopper liner.
I basically create a shell around me with the windblocker with wool insulation. I can sit on the coldest mornings, wind, and rain and just barely get the sniffles.
Hope that helps
Coby