1. Gore-Tex camo parka (W/ pit zips) and pants for the outer "hard shell".
2. Synthetic jacket for insulating layer (If using a down jacket try to get one with Dri-Down or Down Tech treated down. This down is highly resistant to moisture and dries VERY fast.)
HINTS:
->This jacket can also be worn in your sleeping bag to extend its temperature range downward by at least 10 F.
->Zip up and cinch closed the hood of you GTX parka and pull the parka over the foot of your sleeping bag for more warmth and to keep tent frost from melting on the foot of the bag and wetting it.
3. synthetic or wool sweater mid layer
4. expedition (heavy) weight polyester long johns (Cabela's sells many types) base layer. Get zip turtle neck tops. For extreme cold put one size larger CUT OFF bottoms over the long john bottoms. These cut-offs should come to just above your knees to protect your femoral arteries from the cold. Eskimos use a similar setup.
5. Vapor Barrier Lining (VBL) socks of thin neoprene diver's socks that have been seam-sealed. Wear thin poly liner socks beneath them and change DAILY. This will keep your boot insulation warm B/C it keeps it DRY and there are no wool socks ever made that will keep you as warm as the thin, closed-cell neoprene diver's socks.
Yeah, you can get away with duct-taped plastic bags as a VBL but they are fragile.
6. Gore-Tex glove shells with REMOVABLE heavy and medium weight pile or fleece liners. Carry spare liners to always have a dry pair available and choose weight of liners depending on the temps.