I think yoga pants will look great as long as u find some that r small enough for u. If they r skin tight it doesn't matter how skinny u r, u will still look great. But if your yoga pants r loose and there r wrinkles in the seat of it then it doesn't look too great.
Only if they don't actually do yoga. I get it, you like the pants because they flatter your ass or whatever buttttt, it's when the girl wearing them doesn't actually do yoga, that pisses me off. It's like, really? You don't even do the sport. Why would you wear them... it's called being a poser