2024 was a year of enforcement catching up to regulatory intent. Several European authorities had spent the preceding two years building cases and establishing investigative frameworks; last year, a number of those efforts concluded. This isn't a comprehensive catalogue of every enforcement action — that would be a legal database, not a blog post — but it covers the cases that are most instructive for brands thinking about their own exposure.

H&M's Sustainability Claims

The H&M "Conscious" collection claims have been litigated and settled across multiple jurisdictions, but 2024 saw the final closure of several proceedings that had been pending since 2022. The core dispute was whether the Conscious label — applied to garments made with a higher proportion of organic or recycled materials — was substantiated and not misleading about the overall environmental footprint of the products.

The Norwegian Consumer Authority's findings were damaging: the Higg Materials Sustainability Index scores that H&M had relied on to justify the claims were found to be methodologically flawed and unfit for direct consumer-facing communication. That finding reverberated beyond H&M — it effectively challenged the evidentiary basis that many brands in the industry had been using.

The lesson here isn't that the Higg Index is worthless. It's that using a tool designed for internal supply chain benchmarking as the public-facing substantiation for an environmental claim creates a gap between what the data supports and what the claim asserts.

Ryanair's Emissions Advertising

The UK Advertising Standards Authority upheld complaints against Ryanair's claims to be "Europe's cleanest, greenest airline" in early 2024. The ads relied on comparisons with other airlines based on CO2 per passenger per kilometer — a reasonable metric — but the ASA found the overall impression created by the "cleanest, greenest" framing was misleading because it implied a level of environmental performance that couldn't be substantiated by the per-seat efficiency figures alone.

This case is instructive for fashion brands not because it's about airlines, but because of how the ASA reasoned about the gap between a technically-defensible data point and an overall claim that goes beyond what that data point shows. A garment made from recycled fibers might genuinely be less water-intensive than one made from virgin polyester. But saying it's "sustainably made" goes beyond what that comparison can support.

The Dutch Authority's Sector Sweep

The Netherlands Authority for Consumers and Markets (ACM) conducted a sector-wide sweep of online retail sustainability claims in 2024, ultimately reviewing over 400 companies and issuing enforcement decisions against more than 30. The ACM's public guidance document from that sweep is one of the clearest published explanations of how a regulator thinks about the line between substantiated and unsubstantiated claims.

Several of their findings are directly applicable to fashion:

The percentage problem. Claims like "made with 20% sustainable cotton" were challenged where "sustainable" wasn't defined and traceable to a certification with an actual standard behind it. The ACM's view was that if you can't explain what makes the cotton sustainable and how that's verified, the percentage is meaningless.

The certification gap. Displaying certification logos without linking to information about what the certification covers created misleading impressions about scope. A fabric certification doesn't automatically cover the dyeing process, the cut-and-make facility, or the supply chain upstream of the fabric producer.

The collection vs. product problem. Marketing a "sustainable collection" implies something about the collection as a whole. If only some products in the collection meet a given standard, or if "sustainable" has no defined meaning in the context of the campaign, that framing doesn't hold up.

What These Cases Have in Common

The common thread isn't a particular claim or category. It's the gap between the evidence a brand holds and the impression its marketing creates. Regulators are increasingly sophisticated about the difference between a technically-true data point and a holistic claim that goes beyond what the data supports.

The H&M case showed that an industry-standard methodology can still create a misleading impression if it's designed for a purpose other than consumer communication. The Ryanair case showed that a verifiable comparison can still be misleading if the overall framing asserts more than the comparison demonstrates. The ACM sweep showed that using the word "sustainable" without defining it consistently is now, in several jurisdictions, treated as a per se misleading practice.

None of these outcomes required the brands in question to have been lying. They required the claims to have created a misleading impression — which is a significantly lower bar.

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Sources: Norwegian Consumer Authority decision on H&M Conscious (2023–2024); ASA ruling on Ryanair advertising (February 2024); ACM Guidance on Sustainability Claims in Online Retail (September 2024).