get a grip. so she wore clothes of a similar style to you, so what? I wear jeans and shirts a lot, and guess what, so do most other guys. if you have to read anything into it, take it as a compliment - she likes your style. actually, its not even "yours" - there is a limit to how many ways people can dress for school
I'm pretty sure she can wear what she wants. There are only so many styles out there, so by that theory everyone is copying someone else. She's not copying you, she just likes tat style of clothing.Maybe she saw it on you and thought it looked nice. That is her personal style and an outfit of yours may have inspired it. We change our styles all the time based on what other people wear and what we think looks good and as we learn our body types. Do you wear the same things you did in Kindergarten or Middle school? No, you don't. So you saw that style some where and copied it. You made it your personal style. Just as she is.
Stop judging people, they have enough to worry about with out stuck up people like you ragging on them for wearing things they like to wear. ( link