I no longer wear suits to interviews. I don't want to work at a place that requires a suit and tie, therefore I don't feel it necessary to "play dress up" for an interview. It's usually just a button up shirt and khakis. In the winter I'll wear a knit sweater. Plus I feel more comfortable in casual dress, and have a much better time during interviews when I don't feel like I'm being strangled by a tie.
If they decide not hire me because of what I wear, I don't want to work there.