Fashion "dupes," or less expensive versions of high-end clothing and other accessories, are just about everywhere these days. They're also drawing some businesses into legal battles.

Lululemon alleges that Costco has stolen the intellectual property of its Scuba hoodies and sweatshirts, Define jackets and ABC 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