I had a pretty party dress that I wanted to wear to class
Why did you want to wear your party dress to class?
I just want to have a touch of fashion.
Dressing up is fun, but there is a time and a place for everything, and a classroom is for learning. You should instead wear clothing that is not distracting to the educational environment.
But why? parties are a place for fashion.
Parties are a different environment.   It is good to look nice in class, just make sure that what you wear does not district yourself and others.