Dressed in a frock; wearing a dress or robe, especially in a formal or religious context.
From 'frock' (a dress or robe, from Old English 'frock' or Middle Dutch 'frock'), with the '-ed' suffix to indicate a state or condition.
Historically, being 'frocked' was an important ceremony—when priests were formally ordained, they were literally 'frocked' by being dressed in their official robes, and 'defrock' meant removal from the priesthood!
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