Athletic-apparel heavyweight Lululemon Athletica has launched a federal lawsuit against retail behemoth Costco Wholesale, claiming that Costco’s private‑label and partner brands are hawking products that so closely mimic Lululemon’s $128 ABC pants, Scuba hoodies, and Define jackets that they amount to deceptive knockoffs—threatening both the brand’s reputation and its bottom line.
Filed on June 27, 2025, in the U.S. District Court for the Central District of California (Case No. 2:25‑cv‑05864), the suit alleges patent and trademark infringement, invoking legal protections around “trade dress”—essentially, how a product looks and feels in the market.
What triggered the lawsuit?
- Highly similar designs with huge price gaps
Lululemon cites several specific items:- Its ABC stretch chinos/pants, compared against Costco’s Kirkland 5‑Pocket Performance Pant, priced at roughly $20 vs. Lululemon’s $128 model.
- Scuba hoodies, Define jackets, and sweatshirts, mirrored by Costco’s Hi‑Tec Men’s Scuba Full Zip and jackets from Spyder, Jockey, and Danskin—again, at a steep discount.
- Consumer confusion & social media evidence
The complaint points to posts tagged #LululemonDupes across social platforms like TikTok, as well as Washington Post articles pondering whether a hoodie was authentic or a Costco dupe. - Claims of predatory mimicry
Lululemon contends Costco knowingly leverages its brand equity, stating: “One of the purposes of selling ‘dupes’ is to confuse consumers at the point‑of‑sale … believing that the ‘dupes’ are Plaintiffs’ authentic products when they are not.” - Patent & trade dress defense
The lawsuit alleges that Costco’s private-label lines infringe on Lululemon’s patented design elements and trade dress protections, which govern a product’s distinctive visual features.
Legal backbone: patents, trademarks, trade dress
Typically, utility patents (functionality) last 20 years, while design patents (shape, look) expire after 15 years. “Trade dress” refers to a product’s overall look or packaging that distinguishes it in the market. Lululemon asserts it holds valid design patents and trade dress rights for its ABC pants, Scuba hoodies, and Define jackets—rights Costco allegedly infringed.
By filing suit, Lululemon seeks:
- Monetary damages to compensate for lost revenue.
- A court order halting Costco’s infringing products.
- A jury trial.
Why it matters
1. Bigger IP clash in athleisure
This isn’t Lululemon’s first go‑round. Notably, it sued Peloton in 2021 over similar leg‑ging align infringements, ultimately partnering with them for five years. They also privately sued Calvin Klein in 2012, reaching a non‑disclosed settlement. This lawsuit signals Lululemon’s aggressive posture in protecting its visual branding as the athleisure market gets crowded.
2. Pricing pressure and value expectations
Costco’s ultra‑value positioning is a boon for cost-conscious consumers. But Lululemon warns that the low-priced lookalikes “dilute” brand prestige and siphon off revenue—especially amid recent turbulence:
- Lululemon shares dipped ~20% in June due to tariff concerns and sluggish U.S. sales growth (+1% YoY), missing analyst expectations.
3. For retail IP protections at large
A ruling favoring Lululemon could tighten the leash on private‑label copycats—especially in fast-moving retail. But if Costco successfully defends the suit, it may embolden retailers to continue selling “inspired” products.
Costco’s position (or lack thereof)
As of now, Costco has yet to offer any public comments or legal responses. Brands typically respond through court filings, and this case is likely to unfold through procedural motions before reaching trial.
What to watch next
1. Preliminary court responses
Costco needs to file an answer or motion to dismiss. Watch for whether they challenge the validity of Lululemon’s patents/trade dress, or argue fair use.
2. Discovery phase
Lululemon will need to prove ownership of valid rights, similarity of infringing products, and consumer confusion. Costco may counter with internal documents showing design differences or intent to avoid infringement.
3. Financial vs. branding costs
Even if damages aren’t massive, the specter of losing a “guilt-free” athleisure look at Costco may give Lululemon a reputational win.
4. Industry implications
This case may set precedent regarding private-label boundaries and what constitutes infringing similarities—not just for Lululemon and Costco, but across retail.
What this means for Lululemon and Costco
- Lululemon defends its premium branding and pricing strategy by drawing a legal line.
- Costco risks losing a profitable value channel—and the potential to stockpile legal costs if its defense fails.
The outcome may shape how future retailers balance competitive pricing with IP boundaries.
A flashpoint in modern intellectual property enforcement
The Lululemon vs. Costco lawsuit is more than just a brand war—it’s a flashpoint in modern intellectual property enforcement within retail. It pits premium design claims against big-box value in a way that impacts consumers, investors, and industry regulations. Watch this space as documents get filed, motions unfold, and the case eventually heads toward either settlement or jury trial.
Sources
- “Lululemon sues Costco for allegedly ripping off clothing designs,” Reuters, June 27, 2025
- “Lululemon sues Costco over ‘confusingly similar’ apparel products,” Investopedia, June 30, 2025
- “Lululemon files lawsuit against Costco, claims company is selling ‘dupes,’” AP News, July 1, 2025
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