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I'm an advocate of wearing whatever you would normally wear if you wanted to be one notch more dressed up and professional than you normally are -- what you would wear if you were giving a presentation at school, for example.
Ultimately, it's for you: your interviewer probably doesn't care what you wear, but what you wear can have an effect on you and on how you behave in the interview. If you aren't comfortable in a suit and tie, for example, but you wear one to your interview, you'll probably feel awkward, and that will affect the way you interact with your interviewer.
When I did grad school interviews, I wore a sweater and skirt with cute brown pumps. (Very "I'm a serious scientist, but I still like cute shoes.") It made me feel very professional and adult, and I was able to interview successfully because I felt comfortable, yet snappy. Someone else might have felt that way in jeans and a button-down shirt, or in a suit. Whatever works for you is fine.
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