I currently live in Japan and teach English conversation as a side job for additional income.
I have a (very attractive) female student in one of my classes that likes to dress in rather revealing attire, even in the winter. I'm not particularly fond of female students wearing revealing clothes, as I find it annoying to have to use extra energy to keep myself from unconsciously ogling them, even if for just a second too long.
After a while I had the feeling that she was purposefully displaying herself, such as undoing too many buttons on her shirt or keeping her chair unnecessarily pulled back away from the table so that her bare legs are in full view from where I'm standing, but I assumed I was just over-interpreting the situation, being the human male that I am, and she was just dressing how she likes.
However, through conversations with other teachers who also had her in their classes, I learned that she never dresses or behaves in that fashion. I also substituted for them a few times, and in all of those classes she was dressed in more appropriate attire.
I spoke to the director of my school, but the response I got was that as long as the student doesn't actually try to do anything to cause problems, there was nothing that could be done.
Now, I don't know why she dresses like that only in my class. Perhaps she has a job on that day that requires her to dress like that, or she likes to go out to the clubs after class. I have absolutely zero evidence that it has anything to do with me, but now that I know this behavior is specific to my class only, it's beginning to get on my nerves. I might be happy if I was single, but I am happily married and intend to keep it that way.
Edit: I neglected to mention that she repeatedly says "Teacher, you are cute!"(in Japanese" during class. My apologies.
My question: Would it be inappropriate for me to approach this student and ask her to dress more conservatively? I would strongly prefer not to be charged with sexual harassment.
UPDATE: One of the other students in this class took pity on me and gave me some information. 1. She works part time at night after the class which requires her to dress in revealing clothes. 2. She's noticed I actively avoid looking in her general direction except when I look her straight in the eyes, so she's trying to have some fun by being distracting. 3. She actually does think I'm kind of cute and has a slight crush, but nothing serious. It's a little bit of a hearsay because it's coming from a 3rd party, but I feel a bit relieved by having a general idea of what's going on. I'm just going to continue doing what I do since it shouldn't be getting any worse.