Cali, Are you gonna be walking alot or mostly sitting? I use the layering method myself, but I walk alot. I don't layer on heavy clothes, I just layer on alot of thin stuff and have done alot of hunting in below zero weather. Looser is better,period. If your tight and bulky you can't be comfortable, and if you layer alot of heavy clothing over lighter clothing you will just be packing it if you are walking alot.Keep this in mind if you hunt with a full pack.My gear includes,
1 heavy long underwear( tops and bottoms)
2 T'shirt covered by a light fleece jacket and wool pants if it is cold enough. Cold enough being 10 below or better(camo of course)
3 Medium coat( usually wool or fleece.)
4 Good socks and boots
5 Hat of some sort
6 wool mittens that the mitten part comes off exposing the fingers
I would rather be a little cold than too hot.In Montana there is always a little hill that will warm you up if the need arises. TF