Exodus 28:42

‘And you shall not go up by steps to My altar, so that your nakedness will not be exposed on it.’

“These are the garments which they shall make: a breastpiece and an ephod and a robe and a tunic of checkered work, a turban and a sash, and they shall make holy garments for Aaron your brother and his sons, in order for him to minister as priest to Me.

They made the tunics of finely woven linen for Aaron and his sons,

‘And the priest shall put on his linen robe, and he shall put on undergarments next to his flesh; and he shall raise up the ashes to which the fire reduces the burnt offering on the altar and place them beside the altar.

“He shall put on the holy linen tunic, and the linen undergarments shall be next to his body, and he shall be girded with the linen sash and attired with the linen turban (these are holy garments). Then he shall bathe his body in water and put them on.

“And it will be that when they enter at the gates of the inner court, they shall be clothed with linen garments; and wool shall not be on them while they are ministering in the gates of the inner court and in the house.

“Linen headdresses shall be on their heads, and linen undergarments shall be on their loins; they shall not gird themselves with anything which makes them sweat.