I buy my hunting clothing on a budget, since it only sees a couple days to a week of use per year. Tend to get milsurplus US boots - I have uninsulted goretex airforce boots, 200 and 600 gram thinsulate goretex US army boots. Total for 3 pair was same cost as a single pair of higher end boots. Yes, they are a little heavier.
For clothing, I buy whatever wool works from a sweater design standpoint, some is merino that I got on sale, some is just global military surplus. key is it needs to be real wool. I tend to buy thermal underwear designed for skiing, my current favorite is the columbia stuff that has an aluminized lining, it's lightweight, comfortable, wicking and super warm. Most of my hunting is in colder Rocky Mtn climates though, a lot of still hunting and a little less stalking / walking.