'Sackcloth' in the Bible

Now it will come about that instead of sweet perfume there will be putrefaction;Instead of a belt, a rope;Instead of well-set hair, a plucked-out scalp;Instead of fine clothes, a donning of sackcloth;And branding instead of beauty.

In their streets they have girded themselves with sackcloth;On their housetops and in their squaresEveryone is wailing, dissolved in tears.

at that time the Lord spoke through Isaiah the son of Amoz, saying, “Go and loosen the sackcloth from your hips and take your shoes off your feet.” And he did so, going naked and barefoot.

Therefore in that day the Lord God of hosts called you to weeping, to wailing,To shaving the head and to wearing sackcloth.

Tremble, you women who are at ease;Be troubled, you complacent daughters;Strip, undress and put sackcloth on your waist,

And when King Hezekiah heard it, he tore his clothes, covered himself with sackcloth and entered the house of the Lord.

Then he sent Eliakim who was over the household with Shebna the scribe and the elders of the priests, covered with sackcloth, to Isaiah the prophet, the son of Amoz.

“I clothe the heavens with blacknessAnd make sackcloth their covering.”

“Is it a fast like this which I choose, a day for a man to humble himself?Is it for bowing one’s head like a reedAnd for spreading out sackcloth and ashes as a bed?Will you call this a fast, even an acceptable day to the Lord?