LEV 16:4

4 He shall put on the Kesones Bahd Kodesh [(holy linen tunic)], and he shall have the Mikhnesei Bahd [(linen breeches)] upon his basar, and shall be girded with a Avnet Bahd [(linen sash)], and with the Mitznefet Bahd [(linen turban)] shall he be attired; these are Bigdei Kodesh; therefore shall he immerse his basar in mayim, and so put them on.