Interpreting "And you shall make holy garments for Aaron your brother, for splendor and for beauty," Nachmanides taught that the High Priest's garments corresponded to the garments that monarchs wore when the Torah was given.
Maimonides taught that God selected priests for service in the Tabernacle in and instituted the practice of sacrifices generally as transitional steps to wean the Israelites off of the worship of the times and move them toward prayer as the primary means of worship.