Charles Ellicott Commentary Deuteronomy 8:4

"Thy raiment waxed not old upon thee, neither did thy foot swell, these forty years." — Deuteronomy 8:4 (ASV)

Your clothing did not wear out on you. —The Jewish commentators say that it grew with their growth, from childhood to manhood. We cannot say that anything miraculous is certainly intended, though it is not impossible. It may mean that God in His providence directed them to clothe themselves in a manner suitable to their journey and their way of life, just as He taught them how to make and clothe His own tabernacle with various fabrics and coverings of skin. This tabernacle, which was God’s dwelling, was (like the Temple) a figure of humanity. (Compare to Ezekiel 16:10: I clothed you also with broidered work, and shod you with badgers’ skin.)

Neither did your foot swell. —Just as those who were to die in the wilderness could not live, so those who were to enter Canaan were preserved in health through the journey there. It seems allowable to point out the spiritual interpretation of the passage also. If “the way” that God leads any of His children through this present evil world should seem long, and should entail constant need of renewal and cleansing in His sight, He provides us with raiment that does not wear out, in the everlasting righteousness of His Son, and also in the good works which He prepares for us to walk in—that fine linen which is the righteousness of saints. He also says of those that wait on the Lord that they shall walk, and not faint (Isaiah 40:31).