Midrash su Esodo 29:8

11) (Vayikra 8:13): "And Moses drew near the sons of Aaron, and he clothed them with kutanoth.": Just as Moses was made an aid to Aaron, so he was made an aid to his sons. Just as he was appointed over the vestments of Aaron, so he was appointed over the vestments of his sons, as it is written (Shemoth 29:2): "and you shall make consecrated garments for Aaron your brother, for honor and for glory," and (Shemoth 29:8): "And his sons shall you draw near and dress them in kutanoth."