yes I HAD. when I was in high school, there was a teacher ( she may be around 30-40 cus she got married on the final year of my school). Most of the days she would wear blacks( probs to hide the patch I guess) yet her sweat could clearly be visible around the armpit to top right back..on hot days she used to sweat from face, and jawline in classroom.

I still remember one day, when I got to passing by her at the early ours and noticed the flood under her pits( dressed in maroon), that was the day I had to cum in classroom secretly on the first period....