Sweaty clothing dries stiff.

My husband many years ago hung his newly-washed underpants outside on the line in the snow. He was amazed later and came running to me saying "My pants! They have turned to concrete!" They were frozen stiff.

In Africa you can't wear anything synthetic or even cotton/polyester. You just can't. It's 40 degrees and very humid, you'd collapse. I've had on a long cotton skirt and left a circle of sweat on the ground where I stood. It was literally dripping off the hem.