Don't wear a black suit for formal use. 1) you don't want to look dead-serious. Most people like business interactions to be relaxed. 2) most formal matters a

Don't wear a black suit for formal use. 1) you don't want to look dead-serious. Most people like business interactions to be relaxed. 2) most formal matters are conducted in the daytime. Daytime environments--outdoors, fluorescently lit offices, places with the windows open--will be brightly lit and comparatively low contrast. In these environments, black sticks out a mile away. There's a reason black tie is only considered appropriate during the evening, when street lights are on and interiors tend to use more relaxed lighting. 3) there is a rule in America that black suits are only appropriate for very somber occasions. Not everyone knows this rule, but some do. 4) cheap black fabric stands out a mile away. Cheap fabric of any color, not so much. Get a dark ("charcoal") gray suit instead of a black one. Charcoal gray is the world's most boring color, making it perfect for interviews, presentations, important business, etc.