Cats with small patches of white on an otherwise darker coat may be said to have buttons on his coat. Depending on the location of the white spots, a cat may be said to have a locket or mittens. If the white spots are more extensive, the cat's bicolor coat might fall into the category of tuxedo cat, mask & mantle cat, cap & saddle cat, harlequin cat, moo cat or cow cat, or even van cat.