Ezekiel 44:17-19

“When they enter the gate complex of the inside courtyard, they are to dress in linen. No woolens are to be worn while serving at the gate complex of the inside courtyard or inside the Temple itself. They’re to wear linen turbans on their heads and linen underclothes—nothing that makes them sweat. When they go out into the outside courtyard where the people gather, they must first change out of the clothes they have been serving in, leaving them in the sacred rooms where they change to their everyday clothes, so that they don’t trivialize their holy work by the way they dress.