He is to wear the sacred linen tunic, with linen undergarments. He must tie a linen sash around him and put on the linen turban. These are holy garments, and he must bathe himself with water before he wears them.
Jewish Publication Society of America Version (JPS1917) - Leviticus 16:4 >He shall put on the holy linen tunic, and he shall have the linen breeches upon his flesh, and shall be girded with the linen girdle, and with the linen mitre shall he be attired; they are the holy garments; and he shall bathe his flesh in water, and put them on.