What “Sustainable Fabric” Actually Means
There is no single legal definition of a sustainable fabric. The term usually refers to a material with a lower environmental or social footprint than a conventional alternative, whether through how the fibre is grown or produced, how much water, energy or chemistry it uses, whether it contains recycled content or how long the garment lasts. Because each of those factors can point in a different direction, a fibre that is better on one measure can be worse on another. Cotton uses significant water, for example, while synthetic fibres come from fossil fuels and can shed microplastics.
The practical approach for a brand is to choose materials that are verifiably better for a stated reason, use certification where it exists, and make precise rather than sweeping claims. This guide builds on our sustainable fashion sourcing strategy and sustainable wholesale clothing guides.
Organic Cotton
Organic cotton is grown without synthetic pesticides and fertilisers and typically from non-genetically modified seed, under organic farming standards. It supports soil health and reduces chemical use in farming, and it is one of the most recognisable sustainable fibres to consumers. Its limitations are cost, lower yields and the fact that cotton is still a thirsty crop, although organic systems often rely more on rainfall than irrigation. Look for the Global Organic Textile Standard (GOTS), which covers the whole processing chain including dyeing and social criteria, or the Organic Content Standard (OCS), which verifies the organic content of a product but does not cover processing. See our organic cotton T-shirt manufacturer guide for how to verify claims.
Recycled Cotton
Recycled cotton is made from pre-consumer waste, such as cutting offcuts, or post-consumer garments that are shredded and respun. It saves virgin fibre, water and dye, but recycling shortens the fibre, so the yarn is usually blended with virgin cotton or another fibre for strength. This can limit softness and the quality of fine fabrics, so it suits heavier, textured products such as sweatshirts and denim better than very light, smooth jersey. The Global Recycled Standard (GRS) and Recycled Claim Standard (RCS) verify recycled content.
Recycled Polyester (rPET)
Recycled polyester is typically made from post-consumer plastic bottles or textile waste and reduces reliance on virgin fossil resources and the energy to make new polyester. It is widely used in activewear, outerwear and blends. Be aware of two caveats. First, most recycled polyester still comes from bottles rather than old garments, so it does not close the textile loop; second, polyester sheds microfibres in the wash, regardless of whether it is recycled. Certification to GRS helps verify the recycled content, and blends that mix several fibres are harder to recycle at end of life.
Lyocell and Modal (TENCEL)
Lyocell is a cellulose fibre made from wood pulp in a process that recovers and reuses most of its solvent, which gives it a lower chemical impact than conventional viscose. It is soft, breathable and drapes well, and is found in shirts, dresses and soft knits. The branded fibres TENCEL Lyocell and Modal, made by Lenzing, are widely used. The sustainability of any wood-based fibre depends on where the wood comes from, so look for pulp sourced from certified forests, such as those certified by FSC or PEFC, and for evidence from the fibre supplier.
Viscose (Rayon)
Conventional viscose is also made from wood pulp, but through a more chemically intensive process, and it has been linked to deforestation and pollution when sourced carelessly. It is not automatically sustainable. If you want to use it, ask suppliers for evidence of responsible sourcing and manufacturing, such as certified pulp and credible environmental management, or consider lyocell as an alternative.
Hemp and Linen
Hemp and linen (from flax) are bast fibres that need little water and few chemicals to grow, and they produce strong, breathable fabrics that soften with wear. They are good choices for relaxed, durable pieces, though their texture is not to everyone's taste, supply is more limited and prices are higher. They are often blended with cotton to improve softness and cost.
Fabric Comparison
| Fibre | Main advantage | Main trade-off | Useful certification |
|---|---|---|---|
| Organic cotton | No synthetic pesticides; familiar and soft | Higher cost; still water-intensive | GOTS, OCS |
| Recycled cotton | Saves virgin fibre, water and dye | Shorter fibres; often blended | GRS, RCS |
| Recycled polyester | Reduces virgin plastic use | Microfibre shedding; mostly bottle-sourced | GRS, RCS |
| Lyocell (TENCEL) | Closed-loop process; soft drape | Pulp source matters; higher price | FSC or PEFC pulp; fibre supplier data |
| Hemp and linen | Low inputs; durable | Texture; limited supply; price | OEKO-TEX, GOTS blends |
No fibre wins on every criterion, so choose according to the product and the claim you want to be able to make. Longevity matters too: a well-made garment that is worn for years often has a smaller footprint than a short-lived “eco” piece.
Certifications Worth Knowing
- GOTS: organic fibre content plus environmental and social criteria through processing.
- OCS: verifies organic content and chain of custody, not the processing.
- GRS and RCS: verify recycled content and tracking through the supply chain; GRS adds social and environmental requirements.
- OEKO-TEX Standard 100: tests finished textiles for harmful substances; it does not by itself make a product organic or sustainable.
- FSC and PEFC: certify the forests behind wood-based fibres, packaging and hangtags.
- Better Cotton: a programme supporting more sustainable cotton farming, operating on a mass-balance basis, so the finished product does not necessarily contain physically traceable Better Cotton.
Always ask for the certificate, check its scope and expiry, and confirm that your factory and supplier are covered. A certificate held by the fibre producer does not automatically cover the finished garment.
Making Environmental Claims in the UK
The UK Competition and Markets Authority has published a Green Claims Code, and the Digital Markets, Competition and Consumers Act 2024 gives the regulator the power to investigate and fine businesses directly for breaching consumer protection law, including misleading environmental claims. Fashion has been an explicit focus. The practical lessons are:
- Be specific. “Made with 60% recycled polyester (GRS certified)” is better than “eco-friendly”.
- Be accurate and substantiated. Hold the certificates, test reports and supplier declarations that support the claim.
- Do not exaggerate. A garment containing some organic cotton is not “organic” in the same way as one that is fully certified.
- Consider the full life cycle, and do not imply a benefit that a trade-off elsewhere cancels out.
- Keep claims consistent across labels, hangtags, website and social media; see our clothing labelling guide.
This is general information, not legal advice. Check the latest guidance from the CMA and take advice if you plan prominent sustainability claims.
Cost, MOQ and Availability
Sustainable fabrics usually cost more and may carry higher minimums than conventional ones, particularly certified organic and recycled blends developed to your specification. Using fabrics the factory already holds can reduce both. See our low MOQ guide for ways to keep first orders small, and our cost guide to build the extra cost into your landed price. Remember that certification adds audit and paperwork costs for the factory too, and the supply chain needs to be certified end to end for a claim to hold.
Choosing a Sustainable Fabric by Product
- Everyday tees and basics: GOTS organic cotton or OCS cotton jersey. See ring-spun vs combed cotton for yarn quality.
- Hoodies and sweatshirts: organic cotton or a recycled cotton blend in fleece or terry; check weight and pilling. See hoodie fabric GSM.
- Denim: organic or recycled cotton with lower-impact washing; see our sustainable denim suppliers guide.
- Active and outerwear: recycled polyester with GRS certification, accepting the microfibre trade-off.
- Shirts, dresses and drapey pieces: lyocell or linen blends.
Questions to Ask Your Fabric Supplier
- What is the exact fibre composition, and can you provide a test report to confirm it?
- Which certifications cover this fabric, who holds them and when do they expire?
- Where was the fibre grown or sourced, and where was the fabric knitted or woven and dyed?
- What are the minimum quantities and lead times for this fabric in my colour?
- Can you give me a transaction certificate or scope certificate for this specific order?
- What are the care, shrinkage and colour fastness results for this fabric?
Clear, documented answers are the foundation of a claim you can defend. If a supplier cannot answer these questions, treat the sustainable label with caution.
Beyond Fabric: Where the Real Impact Sits
Fabric is only one lever. Production waste, dyeing and finishing, transport, packaging and, above all, how long customers keep and wear the garment all affect overall impact. Brands often make more progress by making fewer, better garments, avoiding overproduction through small test runs, choosing factories with strong environmental and social management and using durable construction. Our guide to sustainable packaging covers another practical step.
Sustainable Fabrics with Ruhrose
Ruhrose works with organic, recycled and lower-impact fabrics across jersey, fleece and denim, with certification documents available where applicable, on low minimums from 500 pieces per style and colour. We will not help you make a claim we cannot support. Start a product enquiry and tell us your target fabric, certification needs and budget.