Ezekiel 44:17-19

17“When they enter the gateway to the inner courtyard, they must wear only linen clothing. They must wear no wool while on duty in the inner courtyard or in the Temple itself.

18They must wear linen turbans and linen undergarments. They must not wear anything that would cause them to perspire.

19When they return to the outer courtyard where the people are, they must take off the clothes they wear while ministering to me. They must leave them in the sacred rooms and put on other clothes so they do not endanger anyone by transmitting holiness to them through this clothing.