sackcloth
From Longman Dictionary of Contemporary EnglishRelated topics: Material & textilessackclothsack‧cloth /ˈsæk-klɒθ $ -klɒːθ/ (also sacking /ˈsækɪŋ/) noun [uncountable] 1 TIMrough cloth used for making sacks2 → wear sackcloth and ashesExamples from the Corpussackcloth• In ten seconds or so I would be either triumphant or in sackcloth and ashes.• I have no wish to see Aitken go through the rest of his life wearing sackcloth and ashes.