Cupro: A Sustainable Alternative to Silk and GOTS vs OEKO-TEX.

 There is a fabric that feels like silk, moves like water, and is made from cotton waste. A fabric that makes your wardrobe softer and leaves the planet considerably better off. That fabric is cupro — and if you shop consciously, it's worth knowing what it is.

At the same time, as a mindful shopper you're constantly stumbling over labels like GOTS-certified and OEKO-TEX approved. They appear on hangtags, product pages, and marketing claims. But what do they actually mean? And does it matter which label your clothing carries?

In this article we explain both questions calmly and clearly. No jargon, no greenwashing — just honest information to help you make better choices.

What exactly is cupro?

Cupro is a semi-synthetic fibre made from cellulose — specifically from the short cotton fibre remnants left over after cotton thread is spun. These residual fibres, known as linters, were traditionally considered a waste product. Cupro gives that waste a second life.

The production process works like this: the linters are dissolved in a copper-ammonia solution (hence the name: copper → cuprum in Latin), after which the liquid is pressed through fine nozzles and hardens into a soft, lustrous fibre.

The result is a fabric that:

• feels silk-soft against the skin
• drapes fluidly thanks to its natural movement
• breathes and regulates temperature — cool in summer, comfortable in autumn
• is biodegradable, because its base is plant-derived
• is vegan and cruelty-free — no animals involved

That last point makes cupro particularly interesting if you want to avoid silk. Conventional silk is produced by silkworms, where the cocoon is boiled to unwind the thread undamaged. Ethically, that's a dealbreaker for many people. Cupro offers an alternative with a comparable feel and drape, but without animal suffering.

Cupro versus silk: an honest comparison

Silk has a mystique. For thousands of years it has been the luxury material for dresses, blouses, and fine linens. But when you place the two fabrics side by side on sustainability and ethics, the picture shifts.

Silk:

• Made by silkworms (Bombyx mori), which makes it by definition not vegan
• Labour-intensive and therefore expensive
• Difficult to wash — requires dry cleaning or careful hand washing
• Biodegradable, but the production process is water- and energy-intensive
• Cannot be produced in warm climates, adding significant transport impact

Cupro:

• Made from plant-based waste material — a circular raw material
• Vegan and cruelty-free
• Machine washable at low temperature (always check the label)
• Biodegradable
• Produces less CO₂ per metre of fabric than conventional silk
• Closed-loop production possible: the copper-ammonia solvent can be recovered and reused

That said, cupro is not perfect. The production process requires chemicals and water, and production quality varies by manufacturer. If you choose cupro, choose brands that are transparent about their suppliers and work with certified factories — such as Cossac, the brand behind our Cupro Drape Midi Dress.

How cupro feels — and why that matters

Fashion is sensory. You wear clothing against your skin all day, and how a fabric feels determines in part how comfortable you are in it — literally and figuratively.

Cupro has a weight and drape close to silk but more accessible. It is smooth without being slippery, light without appearing thin. It falls softly along the body and creates those fluid silhouettes so sought after in evening wear, midi dresses, and elegant tops.

For people with sensitive skin: cupro is hypoallergenic and breathes well, making it less likely to irritate than synthetic fabrics like polyester or nylon. It absorbs moisture and feels pleasant at higher temperatures — a quality it shares with linen and cotton, but in a softer form.

GOTS and OEKO-TEX: finally explained

Now to the labels. You've seen them on hangtags and product pages: GOTS-certified and OEKO-TEX Standard 100. They sound similar but measure fundamentally different things. Understanding the distinction matters, because they are not synonyms.

What is GOTS?

GOTS stands for Global Organic Textile Standard — the world's leading certification for organic textiles. The standard covers the entire supply chain: from the cultivation of the raw material through to the packaging of the finished product.

To be GOTS-certified, a textile product must:

• Contain a minimum of 70% organic fibres (95% for the highest grade)
• Be produced without hazardous chemicals, synthetic pesticides, or artificial fertilisers during cultivation
• Be processed in factories that meet strict environmental and social criteria (including: prohibition of child labour, fair wages, safe working conditions)
• Be audited annually by an independent certification body

GOTS therefore looks not only at what is in the fabric, but also at how and by whom it was made. It is the most comprehensive certification for organic textiles in existence.

At Noumenon, we work exclusively with GOTS-certified suppliers for our organic cotton products. That is not a marketing choice — it is a requirement.

What is OEKO-TEX Standard 100?

OEKO-TEX Standard 100 measures something different. The certification guarantees that the finished product — the garment itself — contains no harmful substances that are dangerous to the health of the wearer. Think heavy metals, formaldehyde, pesticide residues, or allergens.

In plain terms: if a garment carries OEKO-TEX Standard 100, it has been tested and confirmed safe to wear against your skin. Full stop.

But notice what it does not say: OEKO-TEX does not look at how the raw material was grown, at working conditions in the factory, or at the environmental impact of the production process. A garment made from conventional (non-organic) cotton, in a factory with poor labour conditions, can still carry OEKO-TEX Standard 100 — as long as the finished product contains no harmful substances.

The difference summarised

The practical conclusion: both labels have value, but they are complementary, not interchangeable. GOTS is the stricter and broader certification. OEKO-TEX is a solid baseline guarantee for wearability, even for products that are not organic.

If you're choosing clothing that is both truly sustainable and safe, look for GOTS-certified products wherever possible. Found something that carries only OEKO-TEX? Then at least you know it's safe to wear — but you don't know how it was made.

Why Noumenon chooses transparency about fabrics

At Noumenon, we believe clothing carries a story — literally. The fabrics we choose, the brands we bring together, the standards we hold ourselves to: these are not background details. They are the core of what we do.

Our Fair About Fabrics page does not exist as marketing material. It exists because we believe you as a customer have the right to know what you're wearing, how it was made, and by whom. Cupro, ramie, lyocell, organic cotton — we tell the story behind every material, because that story matters.

If you want to shop more consciously but don't know where to begin, understanding fabrics and certifications is a good starting point. Not to be perfect — that doesn't exist — but to gradually make better choices.

Frequently asked questions about cupro and certifications

Q: Is cupro really vegan?

A: Yes. Cupro is entirely plant-based — made from cotton cellulose — and contains no animal by-products. It is one of the few luxury-feeling fabrics that is completely vegan.

Q: Can I machine wash cupro?

A: It depends on the specific garment. Cupro is in principle machine washable on a delicate cycle (30°C), but always check the care label. When in doubt, opt for hand washing or a wool programme.

Q: What is the difference between cupro and lyocell (Tencel)?

A: Both are cellulose fibres produced through a chemical solvent process, but the raw materials differ: cupro comes from cotton waste, lyocell is made from wood pulp (usually eucalyptus). Lyocell has a slightly more matte, understated appearance; cupro has more lustre and a more silk-like drape. Both are biodegradable and vegan.

Q: Do I really need to look for GOTS as a shopper, or is OEKO-TEX enough?

A: If wearability safety is your only priority, OEKO-TEX is sufficient. If you also want to know whether your clothing was produced in a socially responsible and environmentally friendly way, choose GOTS. Our recommendation: use GOTS as a minimum standard for clothing you wear regularly.

Q: Are all products at Noumenon GOTS-certified?

A: Our organic cotton products are sourced from GOTS- and BCI-certified suppliers. For materials like cupro and lyocell, we work with suppliers who are transparent about their production process. We are always honest about what we can and cannot guarantee — check our Fair About Fabrics page for the most current information per fabric.

In closing

Cupro is not a trend. It is a considered material choice for people who love beautiful clothing but refuse to compromise on ethics. GOTS and OEKO-TEX are not equivalent labels — they measure different things, and knowing the difference is worth your while.

Fashion doesn't have to be complicated. But a little knowledge about what you wear makes the difference between a wardrobe that looks good and one that does good.

Curious about our cupro pieces? Explore the Cossac collection at Noumenon — ethically made in Europe, designed to last.