Lululemon Sues Costco Over 'Confusingly Similar' Apparel Products

1. Lululemon is suing Costco for trademark infringement on apparel designs. 2. The lawsuit mentions six products deemed confusingly similar to Lululemon's offerings. 3. Lululemon claims Costco profits from unauthorized, knockoff apparel. 4. The lawsuit seeks damages for sales lost due to Costco's products. 5. Neither Lululemon nor Costco's stock has reacted negatively yet.