You change by wearing fashion. There is a new you. It's someone that had already existed within you, but in order to describe that woman's inner self, or that man's inner self, I created a visual using a mirror.
However, the mirror is not real, and if you look closely, you will find that although the person inside the mirror is you, that person is moving differently.
By having you that appear in the mirror move differently, it describes the new you that is created through wearing fashion.