The athleisure brand is accusing Costco of selling knockoffs of several of its signature designs and offering them at a lower price under the wholesale club giant's Kirkland Signature brand.

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

Lululemon is suing Costco for manufacturing and selling clothing that looks like their own high-end athleisure at bargain basement prices.