Lululemon sues Costco over alleged sale of ‘dupes’ copying $128 pants — priced at just $10

Athletic apparel giant Lululemon is suing Costco for allegedly selling cheap “dupes” of its pricey pants and sweatshirts.

In a lawsuit filed Friday in California, Lululemon alleges Costco has “unlawfully traded” on the brand’s “reputation, goodwill and sweat equity by selling unauthorized and unlicensed apparel employing knockoff, infringing versions” of its products. 

Lululemon, for example, sells its popular ABC men’s pants for $128 – and alleges that a pair of Costco pants that retail for just $10 rip off their design. 

Its Scuba hoodies sell for $118, while Costco’s private label Kirkland Signature sells copycat sweatshirts for $8, the company alleged in the suit.

“As an innovation-led company that invests significantly in the research, development and design of our products, we take the responsibility of protecting and enforcing our intellectual property rights very seriously and pursue the appropriate legal action when necessary,” Lululemon told The Post in a statement.

The Vancouver-based company is accusing Costco of leading customers to believe that these dupes, slang for duplicates, “are in fact manufactured by the authentic supplier of the ‘original’ products.”

Lululemon and Costco did not immediately respond to The Post’s requests for comment.

Lululemon claimed it sent the Washington-based big box retailer a letter in November 2024 accusing it of selling hoodies using the Scuba design.

Costco “subsequently removed at least some of the products that infringed lululemon’s SCUBA,” but later started selling similar products, according to the lawsuit. 

The retailer is still selling the alleged dupes today, Lululemon said in the suit.

The luxury leggings maker is seeking to “fully recover” financial losses through unspecified damages and a court order to block Costco from selling the products.

Lululemon has gone after alleged copycats in the past, suing stationary bike giant Peloton in 2021 for allegedly selling apparel using similar designs.

That suit was settled in 2022, and the companies announced a five-year partnership the following year to sell co-branded clothing.

Lululemon recently slashed its full-year forecast, citing a “dynamic macroenvironment” with added costs from tariffs, low demand amid economic uncertainty and heated competition from other athletic brands.

Shares of Lululemon jumped 2.2% Tuesday.

The stock is down 36% so far this year.