Things have changed since I interviewed. We all had on nice suits with a conservative tie and dress shoes. It was the professional look they wanted to see. When you got into the interview room, they told us to relax and take off the jacket, we are just going to talk for a while.
When you get to the F2F the job is basically yours to lose for sure. I just put the right foot forward. In fact my son graduated from college back in Dec of 16, and he wore a nice conservative suit to all of his interviews. It was well received by the interviewers.
Food for thought. Best of luck.