I did it once as a schoolteacher. And believe me, kids notice everything. Especially girls. I mean, when you're standing at the board and they've got nowhere else they're supposed to be looking, they pay attention to your outfit, hair, shoes, jewelry --even if they don't hear a word you say.
One day, a particularly observant girl raised her hand --in the middle of a discussion on Aristotle, and I asked, "Yes, Emily? Do you have a question about his philosophies?"
"No, I don't. But I just wanted to say I can tell you have lost a LOT of weight!"