Dupes are a common phenomenon in fashion, but they have risen in popularity in recent years thanks to social media influencers. Costco carries men’s, women’s and children’s clothing, including activewear such as yoga jackets, leggings and joggers.

Lululemon is suing Costco, claiming that the store is selling lower-priced duplicates of some of its popular apparel and athleisure-wear. Lululemon said in a lawsuit filed on Friday, June 27, that Costco “unlawfully traded” on the athleisure brand’s “reputation,