This isn't the first time I've heard of candidates being looked down upon for wearing suits to interviews, and I'm really curious what the thought process is behind this.
I've done interviews where the candidate wore a suit, and where they wore jeans and a button-down, and nobody felt offended. The only time someone's clothing made a truly negative impression was when it was clear their suit had most likely been crumpled up in a ball 30 minutes before the interview -- some of his answers to technical questions suggested he was generally sloppy, and his appearance was just one more data point to support that conclusion.
Is there some inherent distrust in someone who shows up in a suit?