When I made my first longrifle, I wore period clothing on my hunts for about the first nine years.
To me, wearing what was worn by Longhunters of the 18th century, gave me a much better idea of what it was like to be out hunting in all weathers. I was (as close as possible) trying to Experience the whole thing, and wearing the same stuff, (breechclout, wool leggings, and a linen hunting shirt or three, (gets down way past minus 30 up here) plus a wool blanket that can be worn in different ways, was part of it.
I must say though, wool leggings (good quality wool) was warmer to me than long-johns, jeans and even a snow-suit, and I felt Free and could walk and run with no hindrance. I wore Canadian winter moose-hide mocs with Felt liners, (not quite H-C, but Warm as toast as long as it was minus 10C or colder, as they stayed dry.)
To me the thrill was about Experiencing all I could of "how it was", and felt going period gear and clothing opened a window to another age for me.... a window into the past.
Only reason I don't don the stuff as much these days, is farm work seems to keep me on the trot, and if I hunt, it's a quick look 'round and back at it.
...Plus the fact my knees don't want to run these days!
Best,
Richard.