Lawsuit claims Costco is infringing on its trademarks, trade dress and design patents from Lulelemon's Define jacket, Scuba hoodie and ABC pants.

Lululemon is suing Costco alleging the wholesale retailer is selling knock-off, or 'dupe' versions items baring its trademark protected designs and marketing terms.

Costco's products cost significantly less than Lululemon clothing. A Lululemon “Scuba” hoodie sells for $99 to $118 on the company’s website, the lawsuit says, while the Costco item costs $8.