Some good tips here! My go-to is taking a sleeping bag with me to the blind/stand. Boots may or may not come off also. There’s always a cut-off piece of closed cell foam under my feet. Those milsurp 3 part bags work well for this; I usually opt for the big green bag. Bag stays up to my shoulders and I ease it down when needed
I have only been to Saskatchewan once. I usually do not hunt in extremally cold weather. So I do not own a lot of the items mentioned here. The sleeping bag worked out very well for me. My hunting buddy has a big commercial sewing machine. he sewed a single shoulder strap on the sleeping bag to keep it up on my left shoulder. Its easy to slide it off your shoulder to make a shot. It kept me plenty warm and I didn't spend a lot of $$$ on cold weather gear.
However, If I lived and hunted in extreme temps I would certainly own the proper equipment.
