He's a freaking basketball coach. I've always thought it was ridiculous that it was the norm for them to dress up. He can wear what he wants and what he's comfortable in. He's not disrespecting the university at all. You can call it weird all you want, but please, he's a basketball coach who sweats, shouts, jumps, and roams the sideline. Perhaps he's just not comfortable enough in normal dress clothes.
Just really fishing for something to complain about at this point, huh?