I've worn a thong to a doctor's appointment where I needed to get a shot in my butt/hip. When the female nurse came to give me the shot, she told me to lower my pants and underwear. I was wearing sweatpants at the time, so I pulled them down on the side the shot was going but I left my thong in place. I remember it was a blue thong and there was no way she didn't notice. She sterilized the area, gave me the shot, and told me I could pull my pants back up. She didn't say anything but I didn't get a chance to see her reaction to my thong. I wish I could have though; it would have been exciting to see a smile or at least some kind of reaction.