'Loincloth' in the Bible

None [is] weary, and none among him stumbles; none slumbers and none sleeps. And no loincloth on his waist is opened, and no thong of his sandals is drawn away.

at that time the Lord spoke through Isaiah the son of Amoz, saying, “Go, untie the sackcloth from your hips and take your sandals off your feet.” And he did so, walking around stripped [to his loincloth] and barefoot.