Exodus 28:39-40

28:39 You are to weave the tunic of fine linen and make the turban of fine linen, and make the sash the work of an embroiderer.

28:40 “For Aaron’s sons you are to make tunics, sashes, and headbands for glory and for beauty.

Exodus 28:43

28:43 These must be on Aaron and his sons when they enter to the tent of meeting, or when they approach the altar to minister in the Holy Place, so that they bear no iniquity and die. It is to be a perpetual ordinance for him and for his descendants after him.