SAN FRANCISCO — In the second such lawsuit filed against a competitor this month, Levi Strauss & Co. alleged that the jeans manufacturer’s trademarked back-pocket stitching is being illegally copied by Abercrombie & Fitch.

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Levi’s also has filed suit against Polo Ralph Lauren in U.S. District Court here, where the jeans company is based.

In citing trademark infringement, Levi’s accused A&F in the federal court lawsuit of using the trademarked pocket design of connecting arches on its Ruehl brand jeans and other unspecified products. Levi’s cited the likelihood of “consumer confusion, mistake or deception” over the identity of the Ruehl stitching.

“LS&Co. marks its Levi’s brand products with a set of trademarks that are famous around the world,” the company said in the lawsuit, filed July 20.

Abercrombie officials could not be reached for comment at the company’s New Albany, Ohio, headquarters.

Levi’s is seeking unspecified losses in profits and other damages. The company wants A&F to turn over inventory and all materials used in the design or associated with promoting the Ruehl jeans.