I like layered wool, starting with Merino long johns in your desired thickness,then a mid layer, either fleece or more wool, then one of Asbells Anoraks with zipper finishing with a windstopper layer.
A very first layer of lightweight silk isn't a bad idea, then add the above.
I found some Wooltimate on sale at Cabelas....love it.
Use it for my outermost layer.
It has windstopper liner
Some will tell you it is noisy....it isn't.
So for me in cold, cold, cold it is silk, Minus 33 merino, fleece body suit, Wooltimate,and maybe the HBS.
Keep in mind this is for sitting still only.
Way too much clothes if you are walking.
In brutal conditions, like late season WI., you will find me in all of that plus my Heater Body Suit.