The Duke of Chartres, later Duke of Orléans Alexander Roslin (1718-1793)

The picture has something of this: people, wear, portrait, opera, woman, man, music, veil, dress, fashion, fashionable, costume, model, musician, stage.
Perhaps it’s a painting of a man in a red and gold outfit with a white hat and a blue sash around his neck and a black hat on his left hand.