Pardon if I repeat advice already given by others. I'm too lazy to read the other post.

Bear in mind some general principles of outdoor clothing. (1) For unpredictable and/or changing weather, plan to layer your clothes. Don't go naked and wear one, heavy duty coat that will keep you warm at -30 degrees . . . you can't take this garment off when it is +20 and you get too hot! Instead, have at least three layers of clothing and take off/put back on layers as needed to regulate body warmth. Take off your outer parka while hiking in to your deer/duck blind; put the parka back on after you cool down. (2) Choose wicking material for your innermost layer of clothing. This can be polypropylene or some other 'wicking' fabric. The idea of 'wicking' fabric is that it removes moisture, such as sweat, from the surface of your body and makes you feel dry and prevents you from feeling cold. (3) Choose wool or synthetic fleece for middle and outer layers. Wool and synthetic fleece retains much warmth when wet. Cotton and goose down, by contrast, retain very little insulation value when wet. There are lots of ways to get wet during outdoor activities -- fall in a stream, fall out of a boat, capsize a boat or canoe, have wet snow fall off of a tree onto the outdoorsman, climb up a steep hill and get sweaty, walk around during a heavy snow storm of wet snow, walk around in a rain storm, etc. (4) Carry an appropriate hat. You lose a LOT of heat through your head. A balaclava is a very good thing to have. Consider having an outer, lightweight shell that sheds water and/or wind.

Here is what I like to wear when elk hunting at 11,500' in SW Colorado. Inner layer of thin polypropylene long underwear bottoms and long underwear top. Medium weight 100% wool trousers (US Army Surplus M51 trousers cost $20 from an internet site -- medium weight Filson wool trousers can be obtained for $160). Medium weight (9 oz?) 100% wool long sleeved shirt from Pendleton. Heavy weight (26 oz) wool vest from Filson. An insulated outer hooded parka that has a goretex outer shell. I wear a medium weight polypropylene balaclava. If I get cold, I'll pull up the hood of the parka. I have a couple of pairs of gloves -- a thin pair which I can wear while operating my rifle -- including pulling the trigger -- and a heavier pair if it really gets cold. I can hunt in this outfit down to about 0 degrees with this whole outfit on (keeping walking at least at a slow pace) and up to 80 degrees by taking stuff off and putting it in my daypack.

With regards to the polypropylene long underwear, I wear this in the mountains in July/August when I'm going backpacking. During the day, typically I'm going to be wearing the polypropylene long underwear bottoms and tops with just a pair of bermuda shorts for modesties sake. This keeps me comfortable at altitudes from 8,000' to 11,500' even in the summer, while hiking with a heavy pack. Remember, the polypropylene wicks away moisture, so you stay dry and cool. The only trouble I have had is that if the sun is out, my navy blue polypropylene can really interact with the sun and get hot when I am lying still, for example during a lunch break. If the polypropylene weren't navy blue but was light, the problem would not exist. It is not an issue when I'm moving -- it is just the strong absorption of solar radiation and then the conduction to my skin -- it almost feels burning. No problems in the shade.