Fellow cheesehead here. When I am sitting for long periods of time I don't mind merino for the layer next to my skin, but prefer something fluffier for the next layer, like heavy weight polarfleece. I bought some super heavy weight items from these guys a few years ago and love it.
https://www.sierra.com/mens-base-layers~d~11326/?perPage=96
One important thing is to ventilate when traveling so you don't overheat and sweat. This is doubly true if you are dragging a deer out
