Adam Clarke on Leviticus 13:47

The garment also - The whole account here seems to intimate that the garment was fretted by this contagion; and hence it is likely that it was occasioned by a species of small animals, which we know to be the cause of the itch; these, by breeding in the garments, must necessarily multiply their kind, and fret the garments, i. e., corrode a, portion of the finer parts, after the manner of moths, for their nourishment. See Lev 13:52 (note).