'Undergarments' in the Bible

The priest is to clothe himself with a linen robe and undergarments. Then he is to take the ashes of the burnt offering on the altar that had been consumed by the fire and set them beside the altar.

He is to wear a sacred linen tunic and linen undergarments that will cover his genitals. He is to clothe himself with a sash and wrap his head with a linen turban. Because they are sacred garments, he is to wash himself with water before putting them on."