UK Green Claims Rules Tighten, Raising Stakes for Fashion Supply Chains

The UK's Competition & Markets Authority just made sustainability claims considerably more dangerous to get wrong. New guidance published last week, building on the CMA's existing Green Claims Code, establishes that liability for misleading environmental claims does not stop with the brand. Any business that makes, repeats, or passes on a green claim can be held responsible if that claim is misleading. That includes retailers who add a "sustainable" badge to a product page based on information a brand supplied them.

The implications for fashion supply chains are significant. A retailer adding sustainability credentials to a product listing based on a brand's assurances is no longer just a passive participant; under the CMA's framework, that retailer could face investigation. The guidance covers brands, retailers, manufacturers, and suppliers alike, which means the legal exposure runs the full length of the chain from fibre to shop floor.

This is not a UK-only moment. Germany's Bundesrat approved an anti-greenwashing law on 30 January 2026 that amends the country's unfair competition framework and implements the EU's "Empowering Consumers for the Green Transition" directive. The law explicitly raises the compliance bar for product claims and labels used on fashion websites, hangtags, and packaging. The European Commission has set 27 March 2026 as the deadline for all member states to transpose the directive, with the rules taking effect across the bloc from 27 September 2026. Germany's vote is one of several national steps now accelerating toward that date.

Recent enforcement actions signal that regulators are not waiting for the rulebook to fully close before acting. Shein was fined €1.15 million, roughly $1.2 million, by Italy's competition authority for misleading environmental claims on its European websites, with the authority specifically calling out how the fast-fashion giant overstated its sustainability practices without adequate evidence. A French civil court separately ruled that TotalEnergies' carbon neutrality messaging was misleading, finding that the company had overstated its ability to become carbon neutral by 2050 without adequate proof. Tyson Foods, meanwhile, agreed to stop making misleading carbon and net-zero claims, adding a food-sector precedent to an enforcement environment that is clearly broadening beyond any single industry.

In the United States, observers are watching litigation and regulatory signals closely. The ExxonMobil lawsuit in Connecticut is being cited as a potential precedent-setter: if state-level legal actions against companies whose environmental messaging does not match reality begin producing wins, the litigation risk for fashion brands making comparable claims could increase sharply. The FTC's green marketing guidelines remain a watchpoint; while enforcement direction is still developing, those guidelines define the standard against which legitimate versus deceptive environmental claims are measured.

The convergence of the CMA's supply chain liability guidance, Germany's implementing legislation, and a growing docket of enforcement fines and court rulings makes the calculus for any fashion business attaching a sustainability claim to a product increasingly perilous. The window for vague, evidence-light environmental marketing is closing, and it is closing simultaneously across the UK, the EU, and, with less certainty about pace, the United States.