Lululemon is accusing Costco of stealing from its "path-breaking" brand by selling dupes of its sweatshirts, jackets and pants.

Lululemon, a premium athleisure company based in Vancouver, Canada, filed its lawsuit against Costco on June 27 in California. The complaint, according to CBS News , alleges that Costco “unlawfully traded” on Lululemon’s “reputation, goodwill and sweat equity” by selling unauthorized knockoffs, infringing on the companies patents

Lululemon is suing Costco, alleging the wholesale retailer knowingly sold knockoff versions or dupes of its popular products.