He shall put on the holy linen coat, and he shall have the linen trousers upon his flesh, and shall be girded with a linen belt, and with the linen turban shall he be attired: these are holy garments; therefore shall he wash his flesh in water, and so put them on.
Read Chapter 16
George Leo Haydock
Washed. On this day the high priest appeared in linen clothes, like one of the inferior priests, without the jewels; though Josephus (Jewish Wars v. 15,) asserts the contrary. (Calmet)
This was a feast of sorrow and of penance. (Tirinus)
Perhaps he put on his more costly attire before he entered the holy of holies, ver. 23, 24. (Haydock)