They are to wear linen turbans on their heads and linen undergarments around their waists. They must not wear anything that makes them perspire.

Exodus 28:40
Make tunics, sashes, and headbands for Aaron's sons, to give them glory and splendor.

Exodus 28:42
Make linen undergarments to cover their bare flesh, extending from waist to thigh.

Leviticus 16:4
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.

Isaiah 3:20
their headdresses, ankle chains, and sashes; their perfume bottles and charms;

Jeremiah 13:18
Say to the king and to the queen mother: "Take a lowly seat, for your glorious crowns have fallen from your heads."

Ezekiel 24:17
Groan quietly; do not mourn for the dead. Put on your turban and strap your sandals on your feet; do not cover your lips or eat the bread of mourners."

Ezekiel 24:23
Your turbans will remain on your heads and your sandals on your feet. You will not mourn or weep, but you will waste away because of your sins, and you will groan among yourselves.

They shall have linen bonnets on their heads, and shall have linen breeches on their loins; they shall not gird themselves with any thing that causes sweat.