Glossa Ordinaria

Like to the Son of man. That is, an angel in the person of Christ, who is now not called the Son of man, but like to him, because he now dies no more. Or, like to the Son of man, because Christ appeared not with sin, but in the likeness of sinful flesh, in whom are all things necessary for the government of the Church. With a long robe. That is, with a priestly vestment, that is, the flesh in which he offered himself, and daily offers, presenting himself to God the Father. Or, the long robe is the Church, with which God is clothed as with a tunic, which is called reaching to the ankles, because the Church is to endure until the end of the world. Girt about at the paps. Daniel saw him girt as to the loins in the Old Testament, because there carnal things are bound fast; here we read of him girt about at the paps, because in the New Testament even thoughts are judged.