Perhaps he's emulating Shakespeare's Henry V, who dressed as a commoner and mingled among them, to find out how he was being perceived by his subjects.
And the 600 deputies of the Third Estate, the commoners, plus their new allies among the nobles and the clergy, have been locked out of their meeting hall.
He remained a commoner and, consequently, always an outsider, useful to the monarchy only as a technocrat who could manage Saudi wealth for the true owners, the royal family.