I have not held a conventional job for years, and much of the clothing I write about is of marginal utility as work wear. That is because on the job clothes ought to be as close to a uniform as a man's personality will allow, which leaves little to write about. In the photos, the dandy Italian industrialist Luca di Montezemolo illustrates the point with monochromatic perfection.
Gray suit, white shirt and gray necktie in the top photo. Blue suit, white shirt and navy necktie in the bottom. A man should keep it simple so others are focused on what he has to say, not what he is wearing.