Question on yoga pants. My wife gets all bent out of shape when she sees the younger crowd (high school age girls) wearing yoga pants, and claims that most of them aren't wearing underwear with these pants because they are too tight (and you would presumably see the lines). I assume this - if true - would apply to all age ranges who wore yoga pants. Honestly, I can't tell if people are/are not wearing under garments with them.

Is that true? Or are yoga pants simply a bit more discrete than other pants?

Is rather rude to stare in public to try and find out....