Recommendations for lightweight, quick-drying underwear for petite women?

I'm planning to do the Long Trail this summer once school lets out, but I've really hated my current underwear on practice treks. I definitely don't want to go commando, so I'd really like to hear what you all can recommend! I wear a small, but I'm usually down to an XS after a week or so on the trail, so ideally it'll be something available in both sizes so I can carry both with me and change as needed.