We found one dictionary that defines the word pick a hole in someone's coat:

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1. pick a hole in someone's coat: Wiktionary

Definitions from Wiktionary (pick a hole in someone's coat) ▸ verb:  (archaic) To find fault with someone. ▸ Words similar to pick a hole in someone's coat ▸ Usage examples for pick a hole in someone's coat ▸ Idioms related to pick a hole in someone's coat ▸ Wikipedia articles (New!) ▸ Words that often appear near pick a hole in someone's coat ▸ Rhymes of pick a hole in someone's coat ▸ Invented words related to pick a hole in someone's coat