But more to the point, Charles, if your logic is to be applied consistently, then a black man should not wear a black suit (or even a dark suit), right? Likewise for brown suits on brown men. Nevertheless, they do look good on men with black or brown skin tone, I think. Perhaps what matters is the exact shade of skin colour and suit colour.
I never overthink whether someone is a “high-contrast” or “low-contrast” person. I also don’t think in terms of rules; I’m more interested in the optimal versus the less-than-optimal. And the slightly less-than-optimal is OK unless you’re the groom or at a white-tie affair. (And if you’re the groom, you’d better not be having an affair.)
I think that contrast within an outfit is more important than contrast between an outfit and someone’s skin tone. For example, an ecru shirt worn with very light tan trousers is going to be sub-optimal regardless of the skin and hair color of the man wearing those items. Switch out either the shirt or the trousers in order to achieve contrast, and the outfit will be fine regardless of who is wearing it. (The exceptions would occur with CASUAL clothing in extreme weather. A white or pale pastel shirt with very light-colored trousers would look good in scorching heat despite the lack of contrast.* And dark trousers, a dark shirt, and a dark coat or sweater would be fine in the winter.)
A charcoal-grey suit on a dark-skinned man will look good as long as the suit fits properly, his shirt is white or a very pale color, and his tie is dark. The stark contrast between the shirt and the suit and the shirt and the tie will provide all the contrast the man needs.
What about a dark-brown suit on a dark-brown man? I think that might not be ideal, but a white shirt would rescue the outfit because it would add the aesthetically pleasing contrast between his suit and his face. Thus, the dark-brown suit would be plenty good enough.
So if a man gets contrast within his outfit, then in the real world I’d advise him not to worry about whether he’s a high- or low-contrast guy. It’s not that big a deal.
Oh, you brought up the matter of applying my “logic…consistently.” First, thank you for implying that I’m capable of logical thinking. However, you might be overestimating my cognitive capabilities. But assuming there’s ever any logic to my arguments, I hasten to point out that I never intend that my presumed “logic” be applied “consistently.” I’m a pragmatist; I believe in bending rules—even breaking them—when real life demands that we do so. Consistency is overrated. And consistently-applied logic is best left to the confines of the ivory tower.
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* If the guy is really, really pale, then a white shirt and light trousers might not be the best choice. But if the temperature is up there, who cares if there’s not enough contrast? Be practical. The last thing you should be doing when you’re sweating is sweating the sartorial details.