Alan Flusser wrote that he likes to first teach a man how to dress all in blue, to which I will add that knowing how to dress entirely in blue is really all that's necessary.
Not that I am proposing that we need no more than blue, for surely Duchamp owners everywhere would rebel before they abandoned their neckties, but it is a foundation that a man can use to build combinations upon.
If there are secrets to wearing blue it is that most elements of the day's clothing should be varied in shade and include white, whether that latter be in the form of a shirt ground, suit stripe, pocket square or all of them. And either two or three items worn above the waist should have patterns of different scales, like the clothing dummy in the photograph (remain humble and leave four patterns for advanced dressers). His hose can add another if he likes.
These changes in pattern and tone in a man's dress are really all that are necessary for successful combinations. The day's clothing might not leap off a magazine page but it will more than suffice to frame a man's face and make a good impression without leaving too vivid an impression.
And that, of course, is the point of the thing.