2 As soon, then, as you entered, you put off your tunic; and this was an image of putting off the old man with his deeds. Having stripped yourselves, you were naked; in this also imitating Christ, who was stripped naked on the Cross, and by His nakedness put off from Himself the principalities and powers, and openly triumphed over them on the tree. For since the adverse powers made their lair in your members, you may no longer wear that old garment; I do not at all mean this visible one, but the old man, which waxes corrupt in the lusts of deceit. May the soul which has once put him off, never again put him on, but say with the Spouse of Christ in the Song of Songs, I have put off my garment, how shall I put it on? O wondrous thing! You were naked in the sight of all, and were not ashamed; for truly ye bore the likeness of the first-formed Adam, who was naked in the garden, and was not ashamed.
Source: Catechetical Lectures (New Advent)