Putting on the Art Teacher Apron

Often when I tell people that I am studying to become an art educator, they respond with surprise or a quizzical look. Most likely this is because I do not act or dress like the stereotypical art student (a.k.a. a hipster). Although I do wear skinny jeans and scarves, my attire consists mostly of casual athletic looking clothes....even though I possess no athletic ability....sheesh who am I???? Maybe I should be a gym teacher....
Ironically, I saw my elementary gym teacher at Big Apple Bagel yesterday and the first thing I noticed was her complete lack of "gym teacher clothes". Instead, she was wearing nice jeans, a fitted jacket, matching shoes, and her hair was perfectly curled. If I had not known her, I would definitely be surprised to hear she teaches fitness to youngsters.
Why do we expect certain people to dress a certain way? If I refuse to change my wardrobe, would the lack of "art teacher" appearance hinder me from finding a job? I realize that first impressions are important for interviews, but how much does my everyday look affect my artistic success? I have thinking about this alot recently, since I will begin my student teaching within the next year. Should I prepare myself by buying more clothes to fit the stereotype??
Maybe I'll just make an artistic apron and put it on when I become an art teacher....just like superman and his super suit :)