The woman in front of me at my regular class seems to have see through pants when she stretches – I feel like I should say something but am not sure how to phrase it without making things awkward. Any ideas?
Maybe gift her a new pair of yoga pants, she may just lack money.
Or ask her for a minute to talk and say you are not sure she is aware of that but her yoga pants seem to be very thin and then explain or show her in the mirror, (of course while no one else is around).
If it were me, I would want someone to tell me. (That may be the best words to start your conversation.)