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plural manteaus or manteaux
A cloak or gown, especially of a kind popular with women in the 17th and 18th centuries. quotations examples
Not to mention the need to keep her manteau from becoming a sort of anti-parachute which sought to lift her free of the pavement.
2006, Thomas Pynchon, “Against the Day”, in Against the Day, New York, N.Y.: Penguin Press, page 816
A long, loose-fitting coat worn by Iranian Muslim women based off the trenchcoat, originally worn with a square Arabic-style hijab and in plain colours, and often associated with liberal politics. quotations examples
As a result of this politics of personal appearance, Iranians have come to refer to three types of woman, defining their politics by the clothes they wear: the chadory, the manteauy, and the maghna'eh-poosh. […] In contrast, the manteauy woman wears the loose-fitting manteau, often fashionably with a colorful, loosely tied head scarf. She generally supports both political and social reform.
2010, Afshin Molavi, The Soul of Iran: A Nation's Struggle for Freedom, W. W. Norton & Company, page 91