how to talk to a teenager about modesty and respect?

Kasia

I have a little sister who just recently turned sixteen years old and I cannot seem to reach her when it comes to modesty and respect (for herself and others). She always likes to test her boundaries and I am not sure how to go about this anymore. She likes to wear a lot of crop tops and short shorts, which is not the problem here but just providing a little bit of context. I’m all for wearing whatever you are comfortable and confident in. What the issue is that she will try to walk around in a bra or will change her clothing with her door wide open so you can see her in her underwear. Whenever we ask her to put a shirt on or close her door, she throws a huge pissy fit and says that we are sexualizing her and have double standards for men (I don’t necessarily disagree with the latter). Today my family was over for Christmas and my brother took off his shirt to eat because he did not want to get any food on it (expensive shirt) and our little sister immediately tried to take off her shirt too?? Not because she didn’t want to get it dirty but because my brother had his shirt off. My mom was not having it but ofc my sister went on another one of her rants. It’s just getting weird… I just don’t think it is appropriate for her to be walking around in no shirts or shorts! Am I in the wrong? Am I old school? What do I say to her for her to understand that this is not okay?

This is a pretty new thing too. She was never like this before.