The real problem, there is no teeth in trying to enforce that they cover their knees. You ask over and over and over, and report them over and over, and nothing comes of it.
What I'd like to see is that the UIL tells us to start charging teams a time out any time we see this due to illegal equipment. That would fix the issue very fast.
Bottom line, if the coach signs the equipment card before the game, its on them, not us.