Lululemon vs. Costco: Law Suit Over “Dupes,” Design Patent, and IP Integrity

The Spandex War. Lululemon Athletica has filed a high-profile intellectual property lawsuit against Costco Wholesale Corporation, claiming that the retail giant’s Kirkland Signature line and other in-store apparel offerings include “knockoffs” or “dupes” of Lululemon’s signature designs. This case pits a premium athletic wear innovator against a cost-conscious retailer—and could shape the future of fashion-focused IP enforcement.

Spandex War: Trade Dress, Design Patents, and Trademarks in Focus

You might think of this as the Spandex War. At the heart of the case are three major IP claims:

1. Trade Dress Infringement

Lululemon asserts that its products—like the Scuba hoodie, Define jacket, and ABC pants—have a unique look and feel that is widely recognized by consumers. This trade dress, the company claims, has acquired secondary meaning in the marketplace, meaning consumers associate the style and fit with Lululemon specifically.

Costco, according to the lawsuit, is selling visually similar products (some labeled “Scuba”) that mimic Lululemon’s seam placement, silhouettes, and styling—creating confusion and diluting the brand’s distinctiveness.

2. Design Patent Infringement

Lululemon alleges that its design patents, which protect the ornamental aspects of apparel, are being violated. The suit includes references to specific patented details such as stitched features, pattern alignment, and even color naming conventions (e.g., “Tidewater Teal”).

3. Trademark Infringement

While not the primary claim, Lululemon also references its federally registered trademark for “Scuba”, arguing that Costco’s Hi-Tec Men’s Scuba Full Zip Hoodie causes additional confusion.

Unfair Competition and the “Dupe Economy”

Lululemon includes a claim of unfair competition, asserting that Costco is freeriding on years of innovation, marketing, and product development. By selling similar styles at far lower prices, Costco may be profiting from the goodwill Lululemon has built without paying the price of original innovation.

This case touches on the broader phenomenon of the “dupe economy,” where social media influencers openly compare lower-cost alternatives to high-end products. The line between “inspired by” and “intellectual property infringement” continues to blur in today’s retail landscape.

Potential Costco Defenses

Costco has not formally responded at the time of this writing, but common legal defenses in similar IP cases may include:

• Functionality Doctrine: Arguing that the design elements (like seams or zippers) are functional and not protectable as trade dress.
• Lack of Distinctiveness: Claiming that the apparel design is common in the athletic wear market and lacks the necessary “secondary meaning.”
• No Likelihood of Confusion: Emphasizing that consumers know Kirkland Signature products are not Lululemon, especially due to branding and price differences.
• Inspirational Design: Positioning the garments as trend-following rather than infringing copies.

Why This Case Matters for Innovation and IP Strategy

This is more than just a squabble over sweatshirts. The Lululemon vs. Costco case represents a clash of business models: one that innovates and commands a premium vs. one that scales and democratizes access to design trends.

For IP strategists, this is a live test case for:

• The strength of trade dress claims without logos.
• The enforceability of design patents in mass fashion.
• The value of branding in the dupe era.

It also raises ethical and legal questions: Where is the boundary between inspired fashion and unlawful imitation? And how should companies protect innovation in an era of ultra-fast, low-cost manufacturing?

🔗 Dynamic Resource Links

Use these curated resources to explore the legal issues, IP concepts, and background information mentioned in this article.

🧠 Intellectual Property Concepts

• Trade Dress (Wikipedia):
  :https://en.wikipedia.org/wiki/Trade_dress
• Design Patent (USPTO Resource):
  :https://www.uspto.gov/patents/basics/types-patent-applications/design-patent-application-guide
• Design Patent (Wikipedia):
  :https://en.wikipedia.org/wiki/Design_patent
• Trademark Infringement (Wikipedia):
  :https://en.wikipedia.org/wiki/Trademark_infringement
• Unfair Competition (Legal Information Institute):
  :https://www.law.cornell.edu/wex/unfair_competition
• Copyright vs. Design Patents (USPTO Comparison):
  :https://www.uspto.gov/ip-policy/copyright-vs-patent

⚖️ Case Background: Lawsuit Coverage

• Lululemon’s Lawsuit Summary (Bloomberg Law):
  :https://news.bloomberglaw.com/ip-law/lululemon-sues-costco-over-knockoff-hoodies-and-jackets
• Costco’s Alleged Lululemon Dupes (CNN Business):
  :https://www.cnn.com/2024/07/10/business/lululemon-costco-lawsuit-knockoffs/index.html
• Lululemon’s Legal Filing (PACER) (subscription or access via RECAP):
  :https://www.pacer.gov/

🏢 Company Information

• Lululemon Company Profile (Wikipedia):
  :https://en.wikipedia.org/wiki/Lululemon_Athletica
• Costco Company Profile (Wikipedia):
  :https://en.wikipedia.org/wiki/Costco
• Kirkland Signature Brand Overview (Store Brands article):
  :https://storebrands.com/kirkland-signature

🧩 Strategic IP Planning Guides

Hall & Hinkelman (2017):

Perpetual Innovation™: A Guide to Strategic Planning, Patent Commercialization and Enduring Competitive Advantage

Includes practical insights on patent strategy, market entry, and defending innovation in competitive sectors like apparel, tech, and manufacturing.

Hall (2025):

Patent Primer 5: Innovation, Invention, and IP Strategy in the GenAI Era

Covers core IP concepts (design patents, trade dress, trademarks, copyrights, and utility patents) and explains how AI is reshaping invention disclosure, authorship, and commercialization.

🔗 Explore these and other related publications:

Perpetual Innovation Books & More: https://perpetualinnovation.org/rapid-strategic-planning-books-resources/

📚 Hall’s Author Page on Amazon: https://www.amazon.com/author/elmerhall

These guides are especially useful for entrepreneurs, legal advisors, innovators, and students seeking to understand the IP terrain in dynamic industries like retail fashion, consumer goods, and GenAI.

GenAI Tools and Disclosure

This article was created using insights and research from:

• Gemini 2.5 Flash (Google)
• ChatGPT-4o (OpenAI)

GenAI was used for brainstorming, synthesis, outline, tone optimization, and clarity of IP terminology. Additional ChatGPT was used to create dynamic links, links to reliable sources/articles, and GenAI prompt suggestions. The final version was reviewed and edited by the human author, Dr. Elmer Hall.

GenAI Follow-Up Prompts

Use these prompts to explore further:

1. “Explain trade dress infringement using fashion industry examples.”
2. “Summarize key court cases involving design patent infringement in apparel.”
3. “What is the difference between trademark and trade dress in IP law?”
4. “Compare Lululemon’s innovation model with that of other athletic brands.”
5. “How can fashion startups protect their designs from knockoffs?”

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