I had one of those once when I worked at a Subway. I knew her parents and knew it would not be condoned by them . So I was a bit rude , I rolled up a dollar bill and pulled the thong up and put it in the strap thenwhen she looked at me werid I said isn't that what you wanted? Her group of freinnds laughed and she never did it again. One of the group of boys there thanked me he had been trying to tell her how slutty she looked. They just got married last year.
I also informed boys I didn't care for the boxers showing please for the health lisence of my store I needed them covered all the way. I had only one or 2 who wouldn't andthey stopped coming in.