One of the mysteries of the English language finally explained.
With plural and (occasionally) singular concord. Baggy working trousers worn in Japan, especially by women.
Early 20th century. From Japanese mompe (also as mompē, regional as mombe) from Ainu omompe, omumbe trousers (from om thigh + -umbe that which is put on), with loss of o- probably through mistaken perception as Japanese honorific o-.
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