Leviticus 16:4

4He must put on a holy linen tunic,
The term “tunic” refers to a shirt-like garment worn next to the skin and, therefore, put on first (cf. Exod 28:4, 39–40; 29:5, 8; 39:27). It covered the upper body only. For detailed remarks on the terminology for the priestly clothing in this verse (except the “linen leggings”) see the notes on Lev 8:7–9 and the literature cited there.
linen leggings are to cover his body,
Heb “shall be on his flesh.” As in many instances in Lev 15, the term “flesh” or “body” here is euphemistic for the male genitals (J. Milgrom, Leviticus [AB], 1:1017, and J. E. Hartley, Leviticus [WBC], 222; cf. the note on Lev 15:2), which the priest must be careful not to expose during such ritual procedures (see Exod 20:26 with 28:42–43).
and he is to wrap himself with a linen sash
The sash fastened the tunic around the waist (Exod 28:4, 39; 29:9; 39:29).
and wrap his head with a linen turban.
Heb “and in a turban of linen he shall wrap.”
The turban consisted of wound up linen (cf. Exod 28:4, 37, 39; 29:6; 39:31; Lev 16:4). It is usually thought to be a “turban,” but it might be only a “turban-like headband” wound around the forehead area (HALOT 624 s.v. מִצְנֶפֶת).
They are holy garments, so he must bathe
Heb “and he shall bathe….”
his body in water and put them on.
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