Case study: Sustainable fashion certification & labeling — a startup-to-enterprise scale story

When London-based startup Good On You launched its sustainability rating platform in 2015, fewer than 12% of UK fashion brands carried any third-party environmental or social certification. By 2025, the company had rated over 6,000 brands across 100+ countries, its app had been downloaded more than 2 million times, and its B2B data licensing arm was generating seven-figure annual revenue from enterprise clients including major retailers. Good On You's trajectory from a three-person team operating out of a co-working space to an enterprise-scale certification intelligence platform offers a concentrated lesson in how fashion sustainability labeling moves from niche advocacy to commercial infrastructure.

Why It Matters

The UK fashion market generates approximately £62 billion in annual revenue and employs over 890,000 people across the value chain (British Fashion Council, 2025). It also produces an estimated 1.7 million tonnes of textile waste per year, with less than 1% of clothing recycled into new garments. Consumer demand for transparency has surged: a 2024 Deloitte UK consumer survey found that 64% of shoppers said they would switch brands based on credible sustainability information, up from 38% in 2019. Yet the proliferation of self-declared claims and unregulated labels has created a "certification fog" that undermines consumer trust and disadvantages genuinely sustainable producers.

Regulatory pressure is compounding the market signal. The EU Green Claims Directive, expected to take full effect by 2027, will require substantiation of any environmental claim made to consumers, with penalties of up to 4% of annual turnover for non-compliance. The UK's Competition and Markets Authority (CMA) has already issued enforcement actions against fashion brands for misleading sustainability claims, including a high-profile investigation into ASOS and Boohoo in 2023. For brands, retailers, and policymakers, understanding how certification and labeling systems scale from startup to enterprise is now a compliance imperative rather than a marketing choice.

Key Concepts

Sustainable fashion certification operates across three distinct layers. First-party claims are made by brands about their own products without independent verification. Second-party standards are developed by industry consortia such as the Sustainable Apparel Coalition (SAC), whose Higg Index provides facility-level environmental and social performance scoring used by over 250 brands. Third-party certifications involve independent auditing against published criteria: GOTS (Global Organic Textile Standard) certifies organic fiber content and processing, OEKO-TEX Standard 100 tests finished products for harmful substances, and Fairtrade certifies labor conditions and pricing in raw material supply chains.

The credibility hierarchy matters because consumer willingness to pay a premium correlates directly with the independence and rigor of the verification mechanism. Research from the University of Cambridge Institute for Sustainability Leadership found that products carrying recognized third-party certifications commanded a 12 to 18% price premium in UK retail, while first-party claims showed no statistically significant premium (CISL, 2024).

What's Working

Good On You's success rested on three interconnected product decisions that proved correct as the market matured.

The first was aggregation rather than competition. Rather than creating yet another certification standard, Good On You built a meta-rating system that evaluated brands against over 500 data points drawn from existing certifications, public disclosures, and supply chain databases. This approach solved the consumer problem of navigating dozens of overlapping labels with varying scope and rigor. The company's rating methodology, developed in partnership with academic researchers at the University of Technology Sydney, assessed brands across five dimensions: environment, labor, animal welfare, governance, and circular economy practices. By 2023, the aggregation model had attracted licensing deals with major retail platforms including Farfetch, Zalando, and The Iconic, which embedded Good On You ratings directly into product listings.

The second was the pivot to B2B data infrastructure. Good On You initially monetized through its consumer app (freemium model with premium subscriptions at £3.99/month). Consumer revenue peaked at approximately £400,000 annually in 2021 but growth plateaued as user acquisition costs rose. The strategic pivot came in 2022 when the company launched its B2B API product, allowing enterprise clients to access brand-level and product-level sustainability data programmatically. This shift transformed the business from a consumer app with thin margins into a data infrastructure provider with enterprise contract values of £50,000 to £500,000 per year and gross margins above 75%. By 2025, B2B revenue represented 80% of total company revenue.

The third was regulatory alignment. As the EU Green Claims Directive and UK CMA green claims guidance emerged, Good On You positioned its data products as compliance tools rather than marketing features. Enterprise clients could use the platform to substantiate claims, identify supply chain risks, and generate audit-ready documentation. This regulatory tailwind accelerated enterprise sales cycles from an average of 9 months in 2022 to 4 months in 2025.

What's Not Working

The scaling journey exposed structural challenges that remain unresolved across the certification landscape.

Data quality and coverage gaps persist as the most significant operational burden. Good On You's rating system depends on brands disclosing supply chain information, but a 2025 Fashion Transparency Index published by Fashion Revolution found that only 52% of the world's 250 largest fashion brands disclosed their first-tier supplier lists, and only 12% disclosed raw material sourcing details (Fashion Revolution, 2025). For smaller brands, coverage drops further: Good On You estimates that 40% of its brand ratings rely on incomplete data sets, requiring algorithmic inference and conservative scoring assumptions. Several brands have disputed their ratings, leading to costly appeals processes and occasional legal threats.

Certification fragmentation creates ongoing confusion. The fashion sector now has over 100 active sustainability labels globally, many with overlapping scope but different criteria. A single cotton t-shirt could theoretically carry GOTS (organic fiber), OEKO-TEX (chemical safety), Fairtrade (labor), and EU Ecolabel (lifecycle environmental impact) certifications, each requiring separate auditing and compliance costs. The annual cost of maintaining GOTS certification for a mid-sized textile mill is approximately £8,000 to £15,000 including audit fees, while adding OEKO-TEX Standard 100 adds another £3,000 to £6,000. For small and medium enterprises, these cumulative compliance costs represent a meaningful barrier to entry (Textile Exchange, 2025).

Greenwashing detection remains imperfect. Despite advances in supply chain traceability, Good On You and similar platforms struggle to verify claims beyond the first tier of the supply chain. The 2024 scandal involving organic cotton fraud in India, where conventional cotton was repackaged with forged GOTS certificates and entered European supply chains, demonstrated the limits of document-based verification. An estimated 20,000 tonnes of fraudulently labeled organic cotton reached major brands before the fraud was detected through isotopic testing by GOTS auditors (GOTS, 2024).

Key Players

Established Organizations

GOTS (Global Organic Textile Standard): the leading certification for organic textiles, covering fiber production through manufacturing, with over 12,800 certified facilities worldwide as of 2025.

OEKO-TEX Association: provides the Standard 100 product safety certification and the STeP facility certification, with cumulative certifications exceeding 350,000 across the textile supply chain.

Sustainable Apparel Coalition (SAC): an industry body of over 250 brands, retailers, and manufacturers that developed the Higg Index suite of tools for measuring environmental and social performance.

Fashion Revolution: a UK-headquartered advocacy organization that publishes the annual Fashion Transparency Index, scoring the world's largest brands on supply chain disclosure.

British Fashion Council (BFC): the UK industry body that has integrated sustainability criteria into London Fashion Week participation requirements and launched the Institute of Positive Fashion.

Startups and Scale-ups

Good On You: the Melbourne-founded, London-expanded sustainability rating platform that transitioned from consumer app to enterprise data infrastructure.

Provenance: a London-based traceability platform using blockchain-anchored supply chain data to verify sustainability claims for fashion and consumer goods brands.

TrusTrace: a Swedish supply chain transparency platform that maps multi-tier supply chains for fashion brands including H&M and PVH, enabling real-time compliance monitoring.

Oritain: a New Zealand-based scientific verification company that uses trace element and isotope analysis to verify the geographic and botanical origin of raw materials including cotton, wool, and leather.

Investors and Funders

Hirschel & Kramer: an impact investment firm that led Good On You's Series A funding round of AUD $5.5 million in 2021.

Fashion for Good: an Amsterdam-based innovation platform backed by founding partner Laudes Foundation (formerly C&A Foundation) that funds and accelerates sustainable fashion startups.

WRAP (Waste and Resources Action Programme): a UK charity that administers the Textiles 2030 voluntary agreement, backed by Defra funding, which supports certification adoption across the UK fashion value chain.

KPI	2020 Baseline	2025 Actual	2027 Target
UK brands with third-party certification	12%	31%	45%
Good On You rated brands	2,000	6,000+	10,000
Consumer awareness of fashion eco-labels (UK)	24%	47%	60%
GOTS certified facilities (global)	10,388	12,800+	15,000
Annual cost of multi-certification (mid-size mill)	£10,000-18,000	£11,000-21,000	£8,000-15,000 (target reduction)
Fashion Transparency Index average score	23%	29%	40%

Action Checklist

• Conduct a certification gap analysis mapping your current labels against regulatory requirements (EU Green Claims Directive, UK CMA guidance) to identify compliance risks
• Evaluate aggregation platforms such as Good On You and Provenance for B2B data licensing to substantiate sustainability claims with third-party validation
• Map your supply chain to at least tier 2 (fabric mills) using traceability platforms such as TrusTrace, and prioritize tier 3 (raw material) mapping for high-risk materials
• Budget for annual certification costs across your product portfolio and investigate mutual recognition agreements between standards bodies to reduce duplicate auditing
• Implement scientific verification (isotopic or trace element testing) for at least 5% of incoming raw material shipments to detect fraudulent certification claims
• Establish internal green claims review processes with documented evidence chains before any consumer-facing sustainability communication
• Join industry collaboration frameworks such as Textiles 2030 (UK) or SAC membership to access shared tools and benchmarking data
• Develop a consumer-facing transparency page linking to certified supplier lists, audit summaries, and raw data behind sustainability claims

FAQ

Q: Which fashion sustainability certification has the highest consumer recognition in the UK? A: Fairtrade has the highest unaided consumer recognition at 68%, followed by OEKO-TEX at 31% and GOTS at 18%, according to a 2024 survey of 5,000 UK consumers by the Fairtrade Foundation. However, recognition does not equal understanding: only 22% of respondents who recognized the Fairtrade mark could correctly describe what it certifies in the fashion context. For brands choosing certifications, the decision should weigh consumer recognition alongside supply chain relevance, regulatory alignment, and total compliance cost.

Q: How much does it cost a small fashion brand to obtain its first sustainability certification? A: Costs vary significantly by standard and supply chain complexity. GOTS certification for a single-site small manufacturer typically costs £4,000 to £8,000 in the first year (including application, audit, and licensing fees), with annual renewal at £3,000 to £5,000. OEKO-TEX Standard 100 testing for a product portfolio of 10 to 20 items costs approximately £2,000 to £4,000. B Corp certification for a fashion company with under £1 million in revenue costs approximately £1,000 per year. Many brands start with a single certification aligned to their primary sustainability claim and add others incrementally as revenue scales.

Q: What is the biggest risk for brands relying on third-party certifications? A: The primary risk is certification fraud in the upstream supply chain, particularly for raw materials sourced from regions with weak institutional oversight. The 2024 organic cotton fraud incident demonstrated that document-based certification can be circumvented through falsified transaction certificates. Brands should supplement certification reliance with periodic scientific verification of raw materials, direct supplier engagement, and monitoring of certification body enforcement actions. The GOTS public database of certified entities should be checked against actual supplier certificates at least quarterly.

Q: How is the EU Green Claims Directive expected to affect UK fashion brands? A: While the EU directive does not apply directly to UK domestic sales, UK brands selling into the EU single market (representing approximately 45% of UK fashion exports) must comply. The directive requires that any environmental claim be substantiated by independent, verifiable evidence based on recognized scientific methodology. It effectively mandates third-party certification or equivalent verification for any green marketing claim. The UK CMA's parallel Green Claims Code, while currently guidance rather than legislation, is expected to become enforceable regulation by 2027, creating similar domestic requirements.

Sources

• British Fashion Council. (2025). The UK Fashion Industry: Economic Impact and Sustainability Metrics Report 2025. London: BFC.
• University of Cambridge Institute for Sustainability Leadership. (2024). Consumer Response to Fashion Sustainability Certifications: A UK Market Analysis. Cambridge: CISL.
• Fashion Revolution. (2025). Fashion Transparency Index 2025. London: Fashion Revolution CIC.
• Global Organic Textile Standard. (2024). Annual Report 2024: Certification Integrity and Fraud Prevention. Stuttgart: GOTS International Working Group.
• Textile Exchange. (2025). Preferred Fiber and Materials Market Report 2025. Lamesa, TX: Textile Exchange.
• Deloitte UK. (2024). Sustainable Consumer Survey 2024: Fashion, Food, and Household Goods. London: Deloitte LLP.
• Competition and Markets Authority. (2023). Fashion Sector Green Claims Review: Findings and Enforcement Actions. London: CMA.
• Fairtrade Foundation. (2024). UK Consumer Awareness and Attitudes Survey 2024. London: Fairtrade Foundation.