Fashion’s Emissions Rebound Makes Fiber Volume the Missing KPI

The apparel industry can improve a mill and still move backward as a system. That is the uncomfortable result in the Apparel Impact Institute’s latest sector estimate: greenhouse-gas emissions rose 6.3 percent in 2024 to 1,003.75 million tonnes of carbon-dioxide equivalent, or 1.004 gigatonnes. It was the second annual increase after a 7.5 percent rise in 2023.

The report was published on September 1, 2026, but the measurement year is 2024. That two-year distance matters. This is not a live reading of September’s orders, and it is not a company scorecard. It is a modeled estimate built from global fiber volumes, assumed apparel allocations, material-impact factors, and production-stage proxies.

Read correctly, the estimate exposes an operating blind spot. Carbon intensity can fall at a supplier or within a material program while the amount of fiber purchased rises fast enough to erase the benefit. A sourcing team therefore needs two controls in the same review: how many kilograms entered the plan, and how much estimated carbon each kilogram carried under a consistent method.

What the 1.004-gigatonne estimate includes

Apparel Impact Institute, or AII, starts with 2024 fiber-production data from Textile Exchange and assigns a share of each fiber to apparel rather than home textiles, footwear, or other uses. Its apparel allocations differ by material: 70 percent for cotton, 55 percent for polyester, 50 percent for viscose, lyocell, and modal, and 46 percent for nylon, among other assumptions.

The model then applies impact factors from the Higg Material Sustainability Index to raw-material extraction, spinning, textile formation, preparation, coloration, and finishing. Because that dataset does not cover finished-goods assembly, AII uses a simplified factor from Quantis’ World Apparel & Footwear Life Cycle Assessment Database as a Tier 1 proxy. It assumes a 40/60 knit-to-woven split and an average 20 percent fabric loss in finished-goods manufacturing.

Within that boundary, textile formation, wet processing, coloration, and finishing—Tier 2 in the report—account for 512.66 million tonnes, or 51 percent. Raw-material production and primary processing represent 259.7 million tonnes, or 26 percent. Yarn and other intermediate processing account for 146.35 million tonnes, or 14.5 percent, while finished-product manufacturing accounts for 85.09 million tonnes, or 8.5 percent.

Those proportions identify where energy and heat projects can matter most. They do not convert a sector model into a product footprint. Corporate offices, consumer use, end of life, and downstream transportation are excluded. Trims such as zippers are not fully represented. The model uses global fiber totals and allocation assumptions rather than a census of every garment made.

AII calls 1.004 gigatonnes a reasonable but not definitive estimate. That qualification should travel with the number every time it is used.

Fiber growth outran the efficiency story

The volume signal comes from Textile Exchange. Global fiber production increased from about 125 million tonnes in 2023 to 132 million tonnes in 2024. Polyester rose from roughly 71 million to 78 million tonnes and represented 59 percent of all fiber output; 88 percent of that polyester was fossil-based.

Recycled polyester grew in absolute terms, from about 8.9 million to 9.3 million tonnes. Its market share nevertheless slipped from 12.5 percent to 12 percent because virgin-polyester production expanded faster. Textile Exchange also reports that 98 percent of recycled polyester came from plastic bottles and that less than 1 percent of the global fiber market came from pre- or post-consumer recycled textiles.

That is why a percentage alone can flatter the operating picture. A brand can increase the share of a preferred material while buying more total fiber. A sector can add renewable electricity while producing more carbon-intensive material. Neither intervention is meaningless; neither is sufficient evidence of an absolute reduction.

The report’s modeled comparison makes the distance visible. Under its business-as-usual assumptions—5 percent annual growth for synthetics and man-made cellulosics and 1 percent for cotton and other natural fibers—AII projects 1.277 gigatonnes in 2030. Its 1.5°C-aligned trajectory instead reaches 0.489 gigatonnes, 45 percent below its recalculated 2019 baseline. These are AII model paths, not FashionMember forecasts.

Build a volume–intensity bridge

The useful management response is not a single carbon number. It is a bridge that explains the change between two comparable periods.

For each material family, record starting kilograms, ending kilograms, the carbon-intensity factor used in each period, and the method version. Then separate the movement into at least three effects:

1. Volume effect: the change in kilograms valued at the prior-period intensity.
2. Intensity effect: current kilograms multiplied by the change in carbon intensity.
3. Mix and method effect: movement caused by fiber mix, production geography, process route, allocation, data revision, or a changed boundary.

That decomposition is FashionMember’s operating framework, not a formula prescribed by AII. Its purpose is to stop unlike claims from cancelling each other on a presentation slide. If purchased kilograms increase 12 percent while modeled intensity falls 5 percent, both facts should remain visible. If a factor changes because its database was refreshed, that should not be presented as a factory improvement.

This last distinction is material in the new report. AII used MSI change-log version 3.12, released in May 2026. Changes include electricity-grid background data, feedstock processes and China production mix for several synthetics, and the boundaries and data for heat setting. Some movement between annual sector estimates can therefore reflect better or different modeling, not only a physical change in 2024.

What a buyer should request

A small brand will not reproduce a global model. It can build a more reliable purchasing record.

Start with ordered and received kilograms by fiber family rather than garment units alone. Units hide the difference between a lightweight top and a lined coat. Keep virgin, mechanically recycled, chemically recycled, and bio-based feedstocks distinct; “recycled” is not a process route. Record whether a claim concerns bottle-derived input or textile-to-textile material.

Join that material ledger to the supplier, facility, country, yarn system, knit or woven route, coloration method, finishing route, energy source, and evidence date. Retain the source of every emission factor, its version, geography, boundary, and allocation rule. When actual facility energy or production data replace a default, preserve the old value and the reason for the change.

The purchasing contract matters as much as the spreadsheet. AII identifies limited supplier finance and short-term buying practices as barriers to efficiency, electrification, renewable electricity, and lower-carbon heat. The UN Fashion Charter’s 2025 progress report similarly calls for brands to move beyond data collection toward collaboration, co-investment, and longer-term solutions. Asking for a better number without helping a mill fund the work can shift the reporting burden while leaving the equipment unchanged.

For an independent brand, a defensible minimum file is modest:

1. kilograms ordered and received by material family and season;
2. composition and feedstock evidence linked to the purchase order;
3. production facilities and processes actually used;
4. energy and heat evidence where the supplier can provide it;
5. factor source, version, boundary, and date;
6. a change log that separates physical improvements from methodological revisions.

The file will not prove the environmental outcome of every garment. It will make the next sourcing decision explainable.

Three scenarios for the next 12–24 months

FashionMember’s base case is that more brands add volume alongside intensity in their climate dashboards, but supplier data remain uneven. This assumes buyers continue to face cost pressure, the major material databases keep evolving, and facility-level primary data expand gradually. Evidence would be more disclosures in kilograms or tonnes, explicit factor versions, and separate explanations for production growth. The case weakens if reporting continues to show only preferred-material shares or intensity ratios.

An upside case would connect the bridge to commercial decisions. Brands would use absolute material budgets during line planning, reduce avoidable overdevelopment, give strategic mills longer order visibility, and co-finance projects in the 51-percent Tier 2 zone. The signal would be independently checked reductions in both purchased material and production-stage emissions without shifting the boundary. It would be disproved by falling reported intensity alongside rising absolute emissions or unexplained supplier churn.

A downside case is metric substitution. Companies could celebrate recycled-content percentages, renewable-electricity coverage, or emissions per unit while total fiber and total emissions continue to climb. Method updates could be described as operational gains, and bottle-derived polyester could be presented as evidence of textile circularity. Clear reconciliations between volume, mix, intensity, and absolute emissions would falsify that scenario.

These scenarios do not predict a specific company’s sales, production, footprint, or regulatory exposure. They describe signals an operator can test as new disclosures arrive.

The decision the sector estimate enables

The new estimate does not say that every factory project failed. AII documents examples of companies reporting absolute reductions and recommends moving from commitments to facility-level implementation, financing supplier action, measuring and scaling what works, and addressing production growth alongside efficiency.

Its sharper contribution is to make a false choice unnecessary. Fashion does not have to decide between cleaner production and lower material growth. It has to account for both.

For a buyer, the practical question is no longer only, “Is this material’s factor lower?” It is, “How much of it are we committing to buy, under which method, and what happens to the absolute result?” Put those answers on the same bridge and the climate plan becomes a purchasing instrument rather than a collection of disconnected claims.

Sources and verification

1. Apparel Impact Institute: Taking Stock of Progress Against the Roadmap to Net Zero 2026 — September 2026 primary report for the 2024 sector estimate, value-chain breakdown, calculation assumptions, exclusions, data revisions, modeled 2030 paths, and recommendations.
2. Apparel Impact Institute report announcement — publication date and the organization’s summary of the 6.3-percent increase, fiber-volume driver, supplier-finance barriers, and four-part call to action.
3. Textile Exchange: Materials Market Report 2025 — primary source for 2023–2024 global fiber volumes, polyester and recycled-polyester volume and share, feedstock mix, and textile-to-textile recycling context.
4. World Resources Institute: Roadmap to Net Zero — original 2021 AII/WRI intervention framework and baseline context; the current report’s recalculated series controls for current-year comparisons.
5. UNFCCC: Fashion Industry Charter for Climate Action Progress Report 2025 — independent institutional context on data quality, supply-chain collaboration, supplier finance, and facility action.
6. Bloomberg via Business of Fashion — contemporaneous reporting used to cross-check the 2023 and 2024 direction, publication timing, and sector interpretation.

Last verified: September 4, 2026. The 1.004-gigatonne figure is a modeled 2024 sector estimate published in 2026, not a live measurement, product footprint, company inventory, or forecast. AII’s boundary and assumptions govern its interpretation. No environmental benefit, company performance, demand, price, or investment outcome is claimed. The synthetic cover is conceptual and not documentary evidence.