As a general rule of clothing, it's better to be overdressed than underdressed. In that spirit, I would err on the side of dressing a bit more formally than what you anticipate to be "normal" for interviews in your field.
In my interviews, I have seen candidates in the full range of clothing, from jeans and t-shirt all the way to a full suit and tie. Personally, I usually wore simple suit pants and shoes, a simple jacket, and either a long-sleeved shirt or a nice and well-ironed polo shirt. I usually combined a dark-ish suit with a more colorful, less formal, shirt.
That said, it probably does not matter much at all. As I said, I have seen people wear all kinds of clothes to their interview, and I have never seen a correlation with interview success one way or the other.