Plural of frock; dresses or long coats, especially the type worn by monks or as formal clothing.
From Old High German 'Frock' or Old English 'frocc,' originally referring to a monk's habit. Over time it came to mean any loose-fitting dress or coat worn by men or women.
The word 'frock coat' was so fashionable in the 1800s that if you weren't wearing one, you were considered underdressed—now it's barely worn except at royal weddings, showing how quickly fashion power shifts.
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