I wear used wind pants that I find in 2nd hand stores. They are uncoated and unlined nylon and were originally sold as running pants in most cases.

I wear a medium but I buy extra large. The extra size gives me a lot of blousyness and they are comfortable to wear even in hot weather.

They are becoming harder to find. I may have to buy lined ones and take out the lining. One also has to be careful that they aren't made of coated material which makes them unsuitible for hot weather.

Most pairs I buy only cost a few dollars.

My wife says they are not very fashionable but they sure are comfortable and functional.