In the past people wore much of their 'kit'.
My Auntie (84) was on about this just a couple of weeks ago.....sorry gentlemen, but it's a little 'underweary'....she said it's easy to get dressed nowadays, but when she was little it was semmit and nicks (pants) and then a chammy (chemise) and a liberty bodice and then a petticoat and knickers (long ones) and stockings, and then a dress, and a jumper over the top if it was cold......that's six layers on the body, before they put a coat and a shawl on to go outdoors.
We don't live like that now, maybe if you're trying to emulate those who did you maybe need to think of their normal layering systems which were much more than even ours.
I asked the 91 year old Uncle, he said, "Aye, boys got layers too....short pants (UK those are underwear) then woolen drawers and long knee length hose, and another pair of shorter ones on top if you had long trousers on or long ones if you had shorts (which came to the knee), a semmit (vest) and then a long sleeved woollen shirt your mother or granny had knitted, and then a proper shirt and a jumper. Men wore a waistcoat too.....so there's four basic layers and five if you were a working man outdoors before you put your jacket/coat/ scarf and hat on.
The tartan wrapped Highlander wasn't simply in one layer either. He wore long linen sarks (came well below his backside in length) and woolen long waistcoat and woolen jacket and hat and then over the top of that he wrapped his plaid. Pleated and belted the plaid had multiple layers around the waist and kidneys and thighs, and enough extra length to come up and over his head and shoulders too. Hose and gaiters kept the feet warm.
The Auntie and the Uncle both say they never slept alone, always with siblings, and the Auntie only every has slept alone when she was widowed; she says it's a cold bed that, and bought an electric blanket
Basically we don't live in layers nowadays, not commonly day in day out as they did in the past with no central heating, expensive fuel and outdoor lifestyles.
Trying to be as hardy as they were in the past needs more than just a change of kit; it needs a change of lifestyle.
I'm with rg598 though; I think it's interesting to hear how you get on with it
I think I'd be inclined to make a big sac of something water proof but lightweight (99p stuff from..(I'll find the link, it's OD ripstop) and use that as a stuff sack for everything from leaves to grass and brash, just to get me off the cold heatsink that is the ground.
atb,
M