Investopediaยท2025-06-30 12:25Core Viewpoint - Lululemon Athletica has filed a lawsuit against Costco Wholesale, alleging trademark infringement due to the sale of clothing that closely resembles Lululemon's designs [2][3]. Group 1: Lawsuit Details - The lawsuit was filed in a California federal court, where Lululemon claims that Costco has unlawfully capitalized on its reputation and goodwill by selling unauthorized apparel that infringes on Lululemon's trade dress and design patents [3]. - Lululemon identified six specific products sold by Costco that allegedly violate its trademarked designs, including a Kirkland Signature pair of pants and jackets from various brands [5]. - The company is seeking damages for potential lost sales due to Costco's sale of these similar products and has requested a jury trial [5]. Group 2: Market Reaction - Despite the lawsuit, neither Lululemon nor Costco's stock prices have been significantly affected, with both companies seeing slight increases in premarket trading [6]. Group 3: Consumer Behavior - The lawsuit highlights a trend where consumers actively seek out "dupes" of popular products, with Lululemon referencing articles from The Washington Post and Wirecutter that discuss Costco's products as near-identical replicas of its own [4].