Ezekiel 44:17-19

17When they enter the gateways to the inner courtyard, they must wear linen clothes. They must have no wool on them while they serve in the gateways to the inner courtyard and in the temple.

18They must wear linen turbans on their heads and linen undergarments. They must not wear anything that makes them sweat.

19When they go out among the people in the outer courtyard, they must take off the clothes that they wore as they served. They must leave their clothes in the side rooms of the holy place and put on other clothes so that they do not transfer the holiness from their clothes to the people.