Have noticed this before, just saw it again. Wyatt Teller wearing black gloves, gets called for holding on red jersey Chief. Why these O-linemen cant get smart and wear gloves that match opponents jerseys - making hands more camouflaged?
Same thing with Def backs. Any small advantage would be worth it.
i remember years ago the story from a Bills lineman - was wearing some bright colored “lucky” gloves and getting holding calls - he changed the color and the holding calls dropped.