Look into your closet and count how many grey shirts you have. Count how many non-grey shirts you have.  Do not be surprised if most of the shirts you own are grey because it is ridiculously in style right now, it was last year and it seems like it is getting trendier and trendier!!! 
Have you taken a train recently? The subway is filled with black uniforms alongside with grey ones. New Yorkers wear a lot of black but who knows, grey may be a sign of other colors coming to visit New York city soon.

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