The linen breeches prescribed Exodus 28:42 are not here mentioned, because they were not to be put on at his consecration, but afterwards in the execution of his office.
Related Commentaries of Leviticus 8:7
Leviticus 8:7
7 And he put upon him the coat, and girded him with the girdle, and clothed him with the robe, and put the ephod upon him, and he girded him with the curious girdle of the ephod, and bound it unto him therewith.