well, I like wool, but never been a BIG fan of it as my base layer, I prefer something that wick's away sweat better and drys faster and well is softer and smoother to the skin than wool!
I always think that where many hunters go wrong in cold weather is being over dressed /insulated when walking in to a stand,
they break a sweat, get core too hot and then once on stand, they have some hat defeated ALL that good gear they have on, by having a damp/sweaty/or wet layer of clothing next to there shin, which, then as core cools down from being stationary and motionless,
you end up cold!
I like to wear as little as possible in on the walk to the stand, carry what I will wear for all day sits and add layers once I sit a while and cool down from hike in!,
even short hikes/walks into stands, i Never wear all my gear or even most of it
coveralls are nice if they have LOTS of zippers to allow venting, but I still carry mine in over wearing!
heater type body suits are also very good things for longer sits or folks that don't like the cold as much!