Agree with all of the other posts. Sober suit, plain (ironed) shirt, understated tie and polished shoes are the suggested ensemble. Dress does not get you the job - your qualifications, demeanor, attitude and considered compatibility for the company will do so instead - but the wrong, or inappropriate, appearance will most certainly detract from the possibility of you actually landing it. The most important thing about dress at an interview is that it should not be noticed; if it's noticed, invariably the conclusions will be negative. If it is not noticed, they will concentrate instead on you, and your skills, experience and aptitudes. Good luck.