Black is not a color, but a lack of color. See below answer to "yahoo questions" about black. So the school color thing has no relevance.
"What colors make black?
Black is the absence of color, or more specifically the complete absorption of light. There is no combination of colors that can create black. To approximate black in painting, some use equal parts of the 3 primary colors - red, yellow and blue; however it is more brown than black."
.......wow a flashback to my year booking days......I would sing a lil jingle to the kids when working with the process inks....yellow red black and blue we can mix any color just got you!!!
Great... for once Napier will be dressed accordingly.
I would guess his wearing black is for the players to distinguish him and the other coaches from the red uniforms during the game. If the team wears black unis, he just might wear red or white for that same reason.