hair shirt
US /ˈher ˌʃɜrt/
UK /ˈher ˌʃɜrt/

1.
毛衣, 苦行衣
a shirt made of coarse animal hair, worn next to the skin as a penance or mortification of the flesh
:
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In medieval times, some ascetics wore a hair shirt to demonstrate their devotion.
中世には、一部の禁欲主義者が献身を示すために毛衣を着ていた。
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The monk's severe penance included wearing a rough hair shirt.
修道士の厳しい苦行には、粗い毛衣を着ることが含まれていた。
2.
苦痛, 自己犠牲
something that causes constant discomfort or annoyance, especially as a self-imposed burden
:
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His constant worrying about trivial matters was a real hair shirt for him.
些細なことへの彼の絶え間ない心配は、彼にとって本当の苦痛だった。
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Living with such strict self-imposed rules became a kind of hair shirt.
そのような厳格な自己課された規則で生きることは、ある種の苦痛となった。