I seem to run warmer than most, so probably not a model for others.
Feet:
All temps: Liner socks, over the calf socks, sock suspenders, uninsulated muck boots. None of this is for warmth. It is to wick away moisture and prevent blisters.
Bottom:
Above 30: Underwear, shorts, brush pants.
Below 30: Underwear, jeans (tucked into boots), brush pants (outside boots).
Top:
Above 20: T-shirt, hunting vest. If it is wetter out or windy, I might put on my hoody for a while until I build up heat, and then take it off and put it in my vest.
5-20: T-shirt, hoody, hunting vest. Might take hoody off if I get warm.
0-5 (with some wind): T-shirt, heated vest (USB battery pack powered), hoody, hunting vest. Might turn off heat if get warm. Just tried this at the end of last season for the first time.
Below 0: I try to stay 0 or above for the dog, since she doesn't have thick fur. Might go below this now that I have a heated vest for her.
Head:
All temps: Orange baseball cap.
Windchill 0-10: Light neck gaiter, hood up on hoody.
Windchill below 0: Something to keep my ears warmer. I use in ear hearing protection, but when really cold, I have gone back to my over the ear hearing protection muffs sometimes. I have also used regular muffs. During the mini hurricane/blizzard last week, I used a fleece gaiter with ear bumps that has a pocket on each side for shake hand warmers.
Hands:
Above 20: Nothing.
Below 20: Mitten gloves. Depending on warmth, more or fewer fingers come out of the mittens. I also put a hand warmer in the pocket on the back of each one.
The temps are approximate. If I am going through deep snow or thick cattails and building a lot of heat, then mittens generally come off. Walking light cover doesn't build as much heat. Sometimes they come off and on several times during a hunt.
My main thing is to never get sweaty in cold weather. I adjust my layers to prevent this.
Dog (Honey):
Above 30: Orange, so I and others can see her, and some chest protection.
20-30: Depending on the wind, wet, I might put on her orange fleece vest, with a strap on cover over the top (to help keep the fleece next to here and keep her from getting her front legs through the arm holes).
5-20: Orange fleece vest, with the cover on top.
0-5: Heated vest, next size up orange fleece vest, with cover on top. I got the heated vest at the end of last season and haven't tried it yet. It will be mostly covered, but concerned about the exposed parts around the neck getting shredded from brush, etc.
She's the first hunting dog where I felt I should do something about the cold. I also think it reduces how many calories she burns, so she doesn't get too skinny (she's already low fat).
This is with the fleece and cover in 15 degrees last week. In the afternoon, it got up to 41 for a high, so the fleece came off, so she wouldn't overheat.