Take it from a guy that has hunted in the cold most of his life................Layers.
The best part of the hunting season here in NY starts when the temps drop in the low 30's as high for the day. This past week the temps have not gotten above mid 20's as a high.
Over the yrs I have tried every combo you can think of, I have come up with a really good combo of layers that work for my for weather down into the 3o's before reaching for the coat or jacket.
I start out with a base layer of silk undershirt and boxers(or polypro boxers), next layer Cabela's mid weigh thermo underwear, next is a duo-fold shirt with the sleeves cut off and a pair of sweat pants and camo fatigues.
The add on and off layers from there are a polartec fleece pullover, a wind shear shirt and a blaze orange chamios guide shirt from Cabela's.
On my feet, polypro sock liners and a pair of knee high wool socks.
I know it sounds like alot of clothing, but it actually isn't, all thin layers.
I prefer seperate fleece and wind shear shirt because I can remove the fleece and still keep the wind shear if needed.
If the temps drop below the 20's I am good for 2-3 hrs with this combo, but after that................I am reaching for my parka & bibs if on stand all day. I normally do a 3 hr sit in the morning, then still hunt the remainder of the day, so the above combo is good.
FDXX75