Boyshorts sounds like something worth trying. I might pick up a pair to find out.
Personally, I wear these Hanes seamless microfiber ones all the time, even riding, and they're AWESOME! No weggies, stretch and move with me (and I'm a pretty active girl), and are light weight and breath easy. Best of all, they're full coverage bikini cut that look damn cute. So there's never have to "slip into something" if things get frisky after a long day.
I'm pretty sure they're hanes... might be something else.