From Alexander Schmemann, Of Water and the Spirit, (St. Vladimir’s Seminary Press, 1974), p. 74-75.

“We know already that the unvesting of the catechumen before Baptism signified the rejection by him of the “old man” and the “old life,” that of sin and corruption. It is indeed sin that revealed their nakedness to Adam and Eve and made them conceal it with vestments. But why were they not ashamed of their nakedness before sin?  Because they were vested in divine glory and light, in the “ineffable beauty” which is the true nature of man. It is this first garment that they lost, and they “knew that they were naked” (Gen. 3:7). But then the post-baptismal vesting in the “robe of light” signifies above all the return of man to the integrity and innocence he had in Paradise, the recovery by him of his true nature obscured and mutilated by sin. St. Ambrose compares the baptismal robe to the vestments of Christ on Mount Tabor. The Transfigured Christ reveals perfect and sinless humanity as not “naked” but vested in garments “white like snow,” in the uncreated light of divine glory. It is Paradise, not sin, that reveals the true nature of man; it is to Paradise and to his true nature, to his primordial vestment of glory, that man returns in Baptism.”