Exodus 28:3

And thou shall speak unto all that are wise hearted
That have knowledge and understanding in mechanic arts, particularly in making garments; and it required men of more than ordinary skill to be employed in making these, because they were uncommon ones, and required a good deal of thought and judgment, and care and application, to make them exactly as they should be:

whom I have filled with the spirit of wisdom;
for besides a common understanding of things, these required a peculiar gift from God, which some men, as Bezaleel and Aholiab had:

that they may make Aaron's garments, to consecrate him
to put upon him at the time of his consecration; and indeed this was one way, by which, as well as by sacrifices, that he was consecrated, see ( Exodus 29:1 Exodus 29:5 Exodus 29:6 ) ,

that he may minister unto me in the priest's office
for the priests, without having these garments on, might not minister in their office; for when these garments were off, as they were when they were out of their service, they were as other men, as laymen, (See Gill on Ezekiel 42:14).