Wear a suit and tie to all white-collar interviews unless you are told specifically not to. Your demeanor/attitude/how you carry yourself will give them all the information they need about whether you will fit in or not; they aren't looking at your suit and thinking: "this guy is overdressed for our workplace, he won't fit in!" They are actually thinking: "we know he won't dress like this every day, but he's really trying to put his best foot forward, he must really want this job!"
Can you get a job without dressing in a suit? Yeah sure, sometimes a company won't care overmuch.
Is it worth taking the risk of being the only guy to interview for the position who didn't wear a suit? Hell no.