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

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

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