Yet, despite this, I will continue wearing my yoga pants in public.
Namaste, dude, I'm comfy and I don't give a crap what you say.
I also have been known to wear obviously PJ pants in public.
As for Jegging, tights and leggings... Leggings are ok if the shirt/top you are wearing could double as a really, really mini dress, the other two... Just say no.
(i will say Jeggings are about the dumbest thing i've ever seen. Either wear yoga pants or jeans. The only exception I could possibly make an exception for would have deer skin or synthetic patches on the inside knee and are riding breeches)