He had a closet full of dark suits. No sport coats. It would be disrespecting the judge to wear something as casual as a sport coat to court. This was long before Judge Wapner and Judge Judy and their various imitators. They have made the bench a little more human.
Nobody takes it seriously.
Judges can put you in jail, take away your kids, make you pay ridiculous alimony. Judges are the only people left in America with the equivalent of personal servants, bailiffs, who still bellow that almost medieval business about oyez, oyezand God save this honorable court. Judges even get prayed over. Some of them need more than a few prayers. They need whole rosaries.