A lot of people do not know what professionalism looks like. Many people think that businesses "want" the casual laid-back look, when, in-fact, the majority of places would not hire anyone based on this appearance. Things like the Apple vs PC commercials from the last decade come to mind, it's a sociological stereotyping that ultimately hinders people's view of what a professional looks like. People really do think that you can roll out of bed and wear virtually anything, with no grooming whatsoever, to a job interview.