Good point, Spooky. If you want to be seen as a professional, you have to look the part. I personaly know a few photographers who are just like you said. They have tatoos, long beards, long hairs, and ride Harleys. The thing is, they are also excelent photographers, but nobody will trust them because they look like they belong to the Hells Angels, which they don't. IN fact, they don't belong to any "Gang," but just go in for 'the look.' They both make 100 per cent of their living as freelancers, and even that can be problematic for them because people take one look at them and instead of a photographer they see a 'drug crazed biker.'
So yes, as superficial as a suit and tie may be, most employers expect anyone interviewing for a job with their company to look neatly kempt and professional.
BUT, they are also getting a lot smarter about being taken in by good looks and facty cloths. You better look the part, but you also better be able to do the job, and have the right answers to the interview questions.