People on social media and news outlets have noted that Costco sells items similar to pricey Lululemon apparel — but are they too similar?

Zip Pullover purchased from Costco will set you back about $8. In a lawsuit, Lululemon Athletica alleged that the Danskin pullover and other products sold at Costco are illegal knockoffs of Lululemon’s premium activewear.

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.In the latest example,