When stand hunting from trees with temps in the mid 20s to mid 30s, I get by well on the cheap.
I start out with Rocky mid-weight, thermal, long underwear, top and bottom(Wally World). Over that, I put on my gray Ralph Lauren, with 67% wool blend (the rest polyester) pants that I got at Goodwill for $3.00. On my top half, I put on my tan L.L. Bean 100% wool zip-up sweater that I got used off the internet for $25.00. Then, I put on my ASAT cotton/polyester non-insulated coveralls over everything. For a hat, I use a Thinsulate headcover that is VERY warm. Also, I wear a thin polyester, pull over head, face cover. On my feet, I wear a pair of wool blend boot socks under my Muck Wetland boots. For my left hand, I wear an insulated Jersey glove and I keep my right(shooting) hand in my pocket until I see a deer. All this works well for about 3 hours on stand for me.