Super helpful, PP.
I have a few pairs of cotton/strech bike shorts that I bought at Target years ago. I love to wear them under under sport skirts or even regular skirts sometimes. I'm a teacher, so I'm climbing on chairs, sitting on the floor, etc., so it's nice not to worry about flashing the kids.
I actually need a few new pairs, but haven't been able to find anything. It's really hard to find cotton lately.