For years, I interviewed for jobs at places where the employees routinely wore t-shirts. Yet I always came to the interview in a coat and tie, and so did just about anybody else who got hired. It's artificial, sure, but it's a way of showing that you're committed, that you really want the job.
What everyone is saying is that showing up and saying, "I want the job" isn't enough. You have to prove it to them. Callbacks, notes, and business attire are ways of doing this.
Another way is to find out everything you can about the business before the interview, then use that knowledge to ask informed questions. Your interviewer will be very impressed. You can also use that knowledge to bring up more things about you that might be pluses for them.
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