What happens when you see your teacher wearin a thong?
What should i do i saw my teachers boobs? | Is It Normal? | vuelvenlasatracciones.com
The only reason an adult at school might bring it up to you is if you behaved inappropriately when you saw it. Your behavior would be the issue, not the thong. It's really not any one's business what your teacher wars as underwear. She is a person too, and you should take the stand and defend her.