You'd think this would be a no-brainer, but it's worth repeating: dress like you're going to an interview, because you are, says Brown. Do your research to find out what the culture is like at the company and if it has any dress code requirements that could be a faux pas, and avoid trying to be gimmicky, he says.
"Even if the dress code is sloppy casual, you don't want to inadvertently tick off anyone interviewing you. Even if your first-round interviewer's a Blackhawks fan and loves that you wore your jersey to the interview, his boss -- the next round -- could be a Detroit fan, and then you're really in trouble," says Brown.
"Dress appropriately for an interview -- it's that simple. You can change back into your ratty t-shirt and hoodie as soon as you disconnect, but this isn't the time to show off your casual fashion," says Malloy.