Why Longevity Is the Most Underrated Sustainability Metric in Fashion
Surbhi ChadhaSustainable fashion's environmental credentials rest on tools and certifications that stop counting at the factory gate.
The industry's dominant approach to assessing environmental impact focuses on production i.e. how a material was grown, processed, and manufactured. What happens after a garment is sold, and how long it stays in active use, has largely been excluded from the calculation, and that exclusion has shaped almost everything that followed.
The Certification Gap at the Heart of Sustainable Fashion
The Higg Material Sustainability Index is the main tool the fashion industry has used to measure how sustainable its materials are. It was created by the Sustainable Apparel Coalition, a group whose membership roster includes Adidas, Gap, H&M, and Patagonia.
The tool measures environmental impact from raw material extraction to the point where fabric production is complete. It does not account for how many times a garment is worn, how often it is washed, whether it can be repaired, or what happens to it when it is no longer used.
Eco-Age consultant Philippa Grogan described the Higg MSI as looking at midday to 3pm on a 24-hour clock face of impact. The full picture, in other words, was never in view.
In 2022, Norway's Consumer Authority ruled that product labels using Higg MSI data were misleading consumers. H&M was warned directly.
The Netherlands came next, directing Decathlon and H&M to strip sustainability claims from their online listings. The Sustainable Apparel Coalition suspended the consumer-facing programme and brought in an independent review. Kering and Adidas stepped away from the Index.
What these rulings exposed went beyond a single flawed tool. Fashion's leading sustainability framework had been built around what's simplest to verify, rather than what actually drives environmental impact.
What the Lifecycle Data Shows
A peer-reviewed cradle-to-grave lifecycle assessment of a woollen garment, the first of its kind in textile science, produced a finding the industry had largely avoided quantifying. It demonstrates how the number of times a garment is worn is the single most influential factor in determining its total environmental impact.
The supporting data is specific.
- Increasing total wears to 400 reduced environmental impacts by 49 to 68 % across all categories measured.
- A garment worn only fifteen times, roughly one season of active use, generates a 5.8 to 6.8 times greater environmental impact per wear than one used through its full lifespan.
A review published in the journal Fashion and Textiles in 2026 confirmed the pattern: the use phase accounts for the second-highest environmental impact across a garment's lifecycle, and in some product categories, the highest.
A five-country wardrobe survey spanning China, Germany, Japan, the UK, and the USA found that clothing typically stays in active use for four years on average. The study also found that consumers who prioritise quality over brand status demonstrate significantly longer active use periods than those who prioritise trend-led purchasing.
Durability is influenced partly by the making and partly by how a garment is positioned and sold. A piece framed as seasonal has a shorter life than its materials might otherwise allow.
Why the Incentive Structure Works Against Longevity
Fashion avoids measuring longevity because durable products threaten a business model that depends on volume.
Why shorter garment lives serve the model
A garment that lasts eight years means eight fewer times the customer needs to buy a replacement. So thin fabric, basic construction, and trend-driven design aren't design failures. They're what a volume-based business model actually needs.
Certifications built around material sourcing make this easy to hide. A brand can hold up an organic cotton certificate, satisfy a disclosure requirement, and say nothing at all about whether the garment survives a year or a decade.
When regulators stepped in
The Norwegian and Dutch regulatory rulings changed the terms of this arrangement. Both authorities treated incomplete sustainability claims as a consumer protection issue rather than a disclosure matter, shifting accountability from voluntary transparency to legal liability.
The ruling in Norway was direct - that the Sustainable Apparel Coalition should not allow its partners to use the Higg MSI in consumer-facing marketing.
Where regulation is now headed
The EU's Ecodesign for Sustainable Products Regulation, in force since 2024, goes further. It includes provisions against planned obsolescence and requires verifiable information on durability and repairability.
A coalition of apparel retailers and material scientists is now developing the first uniform industry standard for garment durability, with numeric scores covering abrasion resistance, tensile strength, and colour retention.
Longevity is becoming a regulated, measurable claim. The brands that have built their sustainability positioning on material sourcing alone will need to answer a question they have been avoiding.
Where Artisan Craft Stands in This
The lifecycle assessment research identifies the construction characteristics that extend garment life: fibre density, seam reinforcement at stress points, colorfastness, and structural integrity that originates in the production process itself rather than in finishing treatments applied to compensate for shortcuts made earlier.
These are also the characteristics that define well-executed traditional craft.
Hand-spun and hand-woven textiles achieve density through the process of their making. The tension a skilled weaver maintains across a loom, the quality of hand-stitched construction at the points most likely to fail under repeated wear, the natural colorfastness of traditional dye processes: none of these can be replicated by accelerating production.
The slower the process, the more of these properties survive into the finished piece.
How to Identify a Garment Made to Last
A few things distinguish construction intended to endure from construction intended to move quickly.
- Seams should be even and reinforced at stress points, particularly underarms and pocket openings, where most garments fail first
- Fabric should feel structurally consistent when held, not thin or loosely constructed in ways that indicate shortcuts at the spinning or weaving stage
- Dyes and print saturation should be consistent throughout, with no patchiness indicating uneven or rushed application
- Buttons, fastenings, and closures are worth close inspection, as these are typically the first elements to fail and the last to receive investment during mass production
- Natural fibres with a tight weave will generally outlast loosely woven synthetic blends in both structural terms and how they age across repeated washing
What We Choose to Measure
Until recently, a brand could make a sustainability claim and have it stop at checkout. The evidence from lifecycle research makes the case that the real calculation begins there. What a garment is made from matters, but how long it lasts is what decides the outcome
At TuDuGu, the artisans we work with, from hand block printers in Bagru to Kantha embroiderers in West Bengal, have not optimised their techniques for speed. Their methods take the time the work requires. A piece made carefully, without stages cut from the process, outlasts one where those stages were compressed.
The lifecycle data now confirms in measurable terms what artisan craft communities have demonstrated across generations. We think that is worth saying plainly, at a moment when the industry is being asked, finally, to measure the right thing.
