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I like NOBDs outfit, as always, but it raises a question...
Does simply moving down on the formality scale (which is obviously where OP was focused when providing examples of items that would be considered "staples") work for this challenge? If not, then wouldn't jeans rank fairly high on the list of staples? Based on the outline provided, I would innately assume that entries should be of the "MC" variety.
Also, does the little stuff count? Navy/grey socks, brown/black leather belts, etc.?