Lululemon Costco Lawsuit: Why Lululemon Accuses Costco of Selling Alleged Clothing Dupes

The Intersection of Intellectual Property Law and Retail Commerce

The intersection of intellectual property law and retail commerce has never been more contested than in today's "dupe culture" era. A high-profile Lululemon Costco lawsuit between athletic apparel giant Lululemon Athletica and warehouse retailer Costco Wholesale Corporation is drawing significant attention from IP attorneys and legal scholars. The case offers a timely lens for examining the limits of trade dress protections. Meanwhile, U.S. District Judge Laura Provinzino holding a DOJ attorney in civil contempt over an immigration case in Minnesota underscores a broader national theme: courts will impose real consequences when their orders go unheeded.

The Lawsuit: Lululemon Takes Costco to Federal Court

Lululemon Athletica filed its lawsuit against Costco in the U.S. District Court for the Central District of California on June 27, 2025. The complaint accuses the wholesale club operator of selling lower-priced duplicates of its popular athleisure clothing. Lululemon requested a jury trial, seeks monetary damages, and demands that Costco cease selling the disputed products.

The infringing products identified in the complaint include the Danskin Ladies Half-Zip Hoodie, Jockey Ladies Yoga Jacket, Spyder Women's Yoga Jacket, Hi-Tec Men's Scuba Full Zip, and Kirkland 5 Pocket Performance Pant — all sold far below Lululemon's original retail prices.

The pricing gap between the two product lines is striking. Costco's "Jockey Ladies Yoga Jacket" and "Spyder Women's Yoga Jacket," priced at around $22, appear to mirror Lululemon's DEFINE jacket at $128. The "Kirkland 5 Pocket Performance Pant," listed online for $10, is alleged to duplicate Lululemon's $128 ABC Pant.

The Legal Claims: More Than Just Similar Styles

This lawsuit goes well beyond a complaint about aesthetic resemblance. Lululemon's filings allege trade dress infringement, unfair competition under the Lanham Act, design patent infringement, and violation of the California Unfair Business Practices Act.

The company's argument hinges on consumer confusion at the point of sale. Some customers incorrectly believe Costco's products are authentic Lululemon apparel, while others intentionally purchase the dupes because they are so difficult to distinguish from the originals. The lawsuit specifically identified Costco's alleged duplication of Lululemon's SCUBA, DEFINE, and ABC product lines, which have "earned substantial fame and considerable goodwill among the public."

The Kirkland Brand Factor

Central to Lululemon's argument is Costco's private-label supply chain. The complaint alleges that Costco uses manufacturers of popular branded products for its Kirkland Signature label, without disclosing that connection to consumers. This lack of transparency, Lululemon contends, leads shoppers to assume a relationship between Costco's budget items and the premium originals — a form of indirect deception the law is increasingly being asked to address.

The Role of Dupe Culture and Social Media

Dupe culture has surged in popularity, fueled by social media platforms and younger consumers seeking trend-forward apparel at accessible price points. The lawsuit noted that hashtags such as "LululemonDupes" have trended on TikTok, with influencers actively promoting these copycat products. Lululemon's strategy appears designed to address not only direct financial harm but the broader reputational erosion that comes from systematic brand dilution across social platforms.

Prior Cease-and-Desist and Partial Compliance

This lawsuit did not emerge without warning. Lululemon notified Costco on November 11, 2024, about infringement of its intellectual property, citing the SCUBA Mark and several U.S. design patent numbers. Costco subsequently removed some of the identified products. However, the company later began selling the Hi-Tec Men's Scuba Full Zip — which Lululemon alleges directly infringes the same protected mark. That pattern of partial compliance followed by resumed infringement significantly strengthened Lululemon's basis for escalating to litigation.

Where the Case Stands Now

The case, numbered 2:25-cv-05864, is active before Judge Fernando L. Aenlle-Rocha in the Central District of California. As of 2026, the court has ordered both sides to complete private mediation no later than July 31, 2026. Recent docket activity shows the judge denied a stipulation related to Costco's amended answer and counterclaims, reflecting active judicial oversight. No trial date has been set.

Establishing liability remains a high bar. Beyond proving trade dress infringement and patent violations, Lululemon must demonstrate that Costco intended to deceive consumers — a notoriously difficult standard in fashion IP cases.

The Broader Judicial Climate: Judge Provinzino and Court Accountability

The Lululemon Costco lawsuit unfolds against a backdrop of heightened judicial assertiveness nationwide. U.S. District Judge Laura Provinzino of the District of Minnesota recently held a DOJ attorney in civil contempt, ordering Special Assistant U.S. Attorney Matthew Isihara to pay a $500 daily fine after the government released an ICE detainee without his identification documents — in direct violation of a court order.

Judge Provinzino rejected the government's argument that understaffing excused non-compliance, stating that "willfulness is not a requirement to impose coercive civil contempt sanctions." Though the contempt was later lifted after compliance, the ruling sent a clear message: institutional burden does not override judicial authority, and courts will enforce their orders against any party — public or private.

Both cases reflect a shared legal reality: courts at every level are drawing firmer lines on compliance and accountability.

Conclusion

The Lululemon Costco lawsuit marks a defining moment for intellectual property enforcement in the age of dupe culture. As federal courts become engaged referees in both commercial and constitutional disputes, brands, retailers, and legal practitioners should take note: compliance with legal standards is not optional, and judicial patience has its limits.