I went in a suit with no tie when I interviewed. Its a great look (recently worn by Dexter villain Isaak Sirko).
To be honest I feel the only bearing a suit has, is on your level of confidence in the interview. Not a lot more.
Said differently - dress in a way that doesn't break your concentration or make you feel self-concious.
The last thing you want is to be second guessing your fashion choice throughout the interview.
As a point of calibration, when I interviewed most people were in black/dark blue suits & white shirts - very safe choices. There were no wild NBA draft suit colours like powder blue or bright red.