According to this piece, What Is ‘Unexpected Red’? in The New York Times

“The ‘unexpected red’ theory is basically adding anything that’s red, big or small, to a room where it doesn’t match at all, and it automatically looks better,”

That makes sense for homes.  It also makes sense for men’s clothing, especially if the colour palette of your clothing is neutral, black or navy. A pop of red — a toque, some shoelaces, a tote bag — can add some pop to your look. So grab some red accessories and add them to your wardrobe.

If you like to shop online, do what I do and on the search line type in “men red”. I find it will come back with all the men’s clothes that are red or have red in them. I’ve found toques, scarves, T shirts and socks that way.

For more thoughts from me on red in fashion, go here.

P.S. I think this theory could also apply for colours like purple and yellow.