>>96539>it will be wetNo cotton. Not even a few percent. Not even underwear. Hell, I don't even use underwear. Cotton gets wet and stays wet. While you are wearing wet cotton, the water slowly evaporates, acting as an evaporative cooler, making you cold. When I backpack there is zero cotton in my pack. None, unless I am going somewhere where it is going to be 100 degrees F and I want some cooling. I also carry a nylon swimsuit in case there will be children at the hot springs.
I have nylon shorts, nylon long pants, cheap polyester fleece long pants for something warm and waterproof (Gore Tex or similar) rain pants, large enough to fit over any combination of the above. I think I paid no more than $25-$35 for each of the above off the sale rack at the local outdoor store or REI or whatever, except the rain pants might have been more. My shirts, sweaters, etc, follow a similar pattern.
You're right, no blue jeans. Not ever. The only caution is all that synthetic stuff can get holes in it from embers shot from a campfire. My solution is I almost never build a campfire, except maybe a small one with really small, dry wood.