Can't go wrong with the old mgmt consultant habit of dressing one notch higher than the client's habitual dress. This conveys not just confidence but success and worldliness. It may sound like BS but for a formal interview, it's an important way of getting respect from the interviewer.
I'd suggest a plain but nice dress shirt (light starch; spread collar best) and a dark solid necktie, with nicely pressed dark slacks and black or dark brown dress shoes.
Re. colors, note that most of the world's alpha male politicians (even the present POTUS) go for dark suits, and solid colored dark neckties: this conveys seriousness, calm confidence, natural authority.
A master of this was the French President Sarkozy: he always wore the same very dark alpha male suit & tie combination, which managed to make him look much taller and more imposing than his natural height and physical frame would have done.
Good luck!
I'd suggest a plain but nice dress shirt (light starch; spread collar best) and a dark solid necktie, with nicely pressed dark slacks and black or dark brown dress shoes.
Re. colors, note that most of the world's alpha male politicians (even the present POTUS) go for dark suits, and solid colored dark neckties: this conveys seriousness, calm confidence, natural authority.
A master of this was the French President Sarkozy: he always wore the same very dark alpha male suit & tie combination, which managed to make him look much taller and more imposing than his natural height and physical frame would have done.
Good luck!