So I'm not a yogi, and usually i just wear shorts / capris and a t-shirt to work out. But I have a new pair of yoga pants I'd like to wear and I'm not sure what to wear under there! I'm used to cycling, so with cycling shorts they are tight and you don't wear undies, just the shorts but they are pretty structured. Are yoga pants supposed to be like that, seems kind of.... icky. But with underwear there are the unsightly panty lines since the yoga pants are tight, and wearing a thong to work out seems uncomfortable to me. The other sport I routinely do is swimming, and it's pretty straight forward, swim suit on, and away you go.