I used really cheap aliexpress tafetta nylon for these and they’re amazing. This fabric breathes more than hyperD or any other breathable fabric that I have seen.
I use elastic cordage for the foot and waist band and that’s it. These work really well and add tons of heat, even in snowy winter conditions.
They’re also ideal for summer to shed bugs while not getting too clammy against my skin. At 42 grams, hard to beat the weight to utility ratio.