Don't laugh! This is a real problem! I bought On Gossamer and Commando cotton-rich panties in the smallest size possible, in both briefs and boy shorts. I never, ever thought I would have to say this, but they are all just too big and the other day a pair hooked on my hoo-hah right in a meeting. There is NO delicate way to haul your panties out of your crotch in a meeting, let me tell you. And when I wear them to work out underneath non-spandex capris, the extra fabric wads in ways I'm not even going to decribe. It's horrible.
I'm not that small! I have lots of friends smaller than I am! Surely someone makes cotton no-vpl panties in xs?!