i do yoga & certainly do it nude at home... not so sure i'd be doing some of the postures in a room full of strangers though - especially downward dog!
The sleeping position of a yogi is even more "inviting", but we don't make it often in a course.
But downward dog and plow are quite frequent postures, but for these I have much smaller audience when doing it nude...
(I think it's already quite revealing under my leotard, but without...
)