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As far as your pics above are concerned - i think the blackwatch and pocket hanky are fine - the second one I'm not keen on the PS at all - the tie is ok. I suppose.
Is the suit blue??
Anyway I don't think it applies to a light blue shirt and I don't think a tie is a solid wall of colour like a jumper or jacket.
I suspect as someone else said it was a handy rule of thumb and mainly for womens clothing.
I still don't like green clothing much.