Levis (n.)

1926, American English, originally Levi's, from the name of the original manufacturer, Levi Strauss and Company of San Francisco. The Bavarian-born Strauss had been a dry-goods merchant in San Francisco since 1853; his innovation was the copper rivets at strain points, patented in 1873 according to the company. A cowboy's accessory at first, hip or fashionable from c. 1940s.

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Definitions of Levis from WordNet

levis (n.)
a popular brand of jeans;
Synonyms: Levi's