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I'm not sure how to solve the problem of fast, light and compact materials without using mostly delicate, temperamental modern fibres.
In scotland, for example, you can get heat, very humid air, sideways rain, 50mph wind and snow on the same day, same in places like NZ. These conditions would totally wreck you if you tried just carrying a woollen blanket and leather clothes/coat - the mist and lashing rain would penetrate even a magic oilskin coat (through the holes in the head and sleeves), the sweat inside the coat would build up and then chill, dowsing you in cold water, and the material itself would soak out and ruin your day with conduction and convective cooling. The clothes would become sodden, cold and heavy and convect heat, the windchill would make it all 10x worse and the insulation provided by both would barely warm you on a dry, clear summer night. People died of exposure a lot back then - in fact, one of the most common deaths was slipping in cold water and simply drowning or dying of hypothermia a few miles from home as a result of your woollen, linen and leather clothes freezing you and never drying.
Something that's missed out of fantasy larping is that historical people would travel between inns, shelters, houses, caves, huts and proper military encampments with fireplaces and insulation, or risk dying of exposure, and were probably miserable with their heavy clothes that never dried in proper rain or overheating them in beating heat. Nessmuk and the like constantly built fuckoff great big fires that we can probably still find traces of today - without that key tool, they would have had to have lugged large amounts of spare clothing made from hydrophilic, slow drying natural fibres.
