Lululemon 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.”

The Canadian athleticwear retailer filed a lawsuit against the retailer for selling products it says are confusingly similar to its own.

In a 49-page lawsuit filed in California, Lululemon accused the retail wholesaler of selling knockoff versions of its Scuba clothing and popular ABC men’s pants.