What did the high priest wear on the Day of Atonement?
Leviticus 16:4 (ESV)
4He shall put on the holy linen coat and shall have the linen undergarment on his body, and he shall tie the linen sash around his waist, and wear the linen turban; these are the holy garments. He shall bathe his body in water and then put them on.
After bathing himself, the high priest removed his normal garments and put on simple linen clothes: tunic, sash, and a turban.
4 He shall put on the holy linen coat and shall have the linen undergarment on his body, and he shall tie the linen sash around his waist, and wear the linen turban; these are the holy garments. He shall bathe his body in water and then put them on.