I have another story. This one is about my biology teacher. So when I was in 10th grade, I had this tomboy biology teacher. She wasn't hot, but she had a nice booty.
One day, our head of science walked into our room and asked my biology teacher for some files. She went to her filing cabinet, and crouched down so that she could go through the lower cabinet. There, I was able to see her white thong. In fact, I think our head of science got to see the thong too. He didn't stay long though. He just took the files from her and left the room.
Another story. This one is about my 11th grade head of year. So she was a P.E teacher, and she would always come to school wearing workout clothes. One day, she came to school wearing a blouse and a pair of white business pants. Oh boy, this was a treat. Her business pants were so revealing, and I could clearly see her red g-string. And during assembly, one of the teachers got behind her and started shifting her pants. Maybe the other teachers got to see her underwear, and they tried to save the embarrassment.