it depends a lot on what part of the country you are from and what style of hunting you do. You probably don't need to wear the same thing I did running a trapline east of Fairbanks, AK when it was -30, but in fact the layering plan is still the same here in Idaho when I'm duck hunting. We've hunted in temps from -14 to +80 and I start out with the same base layer, a thin moisture wicking loose fitting UA cold gear camo shirt. That's the only layer I have when it's warm, +45-80. As it gets colder, I'll wear a light cotton camo sweatshirt over that, then will add a windshear camo quarter zip if it's a bit brisk and windy, all of these layers are reasonably thin and will work for temps down to +30. Any colder than that and I add my camo down jacket and that's about it, not a parka, just a jacket, it's not as thick and cumbersome as my parka that I'd only wear when I didn't need to shoot. I don't like goretex, I just don't like the feel or movement of it. On the coldest hunt this year, -14 and I wore all layers and was comfortable. I only add a waterproof layer if it's actually raining, but usually have it stuffed in the blind bag just in case, it's a single thin layer camo jacket. Most hunts I start out with just a few layers on the way to the blind and setting up decoys, then add layers waiting for the sun to rise, then start taking them off as the day warms up. Good gloves or even mittens when it's cold that have the flip open finger area is important. I always wear a face mask, usually a heavy knitted stocking cap type. Heat is lost through the extremities, arms, hands, head and feet. Once you've started losing core heat you are pretty much done for the day. All of my layers are camo. Hunting in southern states or in areas where temps are usually around freezing or above won't probably require the down jacket. If it's above freezing when I leave the house in the morning, I usually put the down jacket in the blind bag just in case the weather turns and only put it on when I'm done with any activity. The last thing you want to do is get hot and sweaty before you start hunting, thus the layering.