Joe Ng, CEO of fashion studio Shift, said Lululemon's pants may have inspired Costco's, but the design isn't as unique as a lawsuit claims.

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

Lululemon is accusing Costco of stealing from its "path-breaking" brand by selling dupes of its sweatshirts, jackets and pants.

Lululemon has filed a lawsuit against Costco claiming that the membership-based wholesale retail company sold similar products that confused Lululemon’s customers.

Kirkland Signature is now bigger than some of the world’s biggest companies—and it has become essential to Costco’s business.

Costco Wholesale Corporation (NASDAQ:COST) is one of the 12 best consumer goods stocks billionaires are quietly buying. On July 1, Lululemon filed a lawsuit against Costco, accusing the retail giant of selling unauthorized lookalikes of its popular SCUBA hoodies,

Lululemon has a steep hill to climb. The line between following a trend and illegally copying a design can be quite subjective.

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

Lululemon says one of the duplicates that Costco sells is the Hi-Tec Men’s Scuba Full Zip, with the lawsuit showing a screenshot image of Costco’s website showing the item priced at $19.97.