I never wear underwear when i work out. So i try to stay away from wearing tight white pants in case they become see through with sweat. But you might want to try it, it eliminates sweating down there, nice breezes and everything, and a lot more comfortable.
Personally i despise the wedgie factor and the uncomfortable g strings all sweaty and cold when doing cardio, and as bad as it is, they always put treadmills right in front of where the men lift their weights so they can stare at your butt as it jiggles, embarrassing, so i don't want to have to be reaching behind to fix my panties to make it any more embarrassing as it is.