Sustainable Clothing Manufacturers in Europe: The Real Guide | NovaSupplier
Sustainable Clothing Manufacturers in Europe: What the Certifications Actually Mean
Matias Santos, Founder·
"Sustainable" is one of the most overused words in the fashion industry, and nowhere is it more abused than in supply chain claims. This guide is for brand founders who want to make credible sustainability claims, not just marketing ones, and who need to understand what certifications, production practices, and sourcing decisions actually matter. It breaks down GOTS, OEKO-TEX, and SA8000 in plain terms, and explains how to verify a factory's claims before you commit to an order.
The Baseline: Why European Manufacturing Is Already More Sustainable
Before getting into certifications, it's worth understanding the baseline advantages of European production:
Labour law compliance: EU member states have legally enforceable minimum wages, working hour limits, safety regulations, and social security requirements. This doesn't mean every European factory is a model employer, but it does mean there's a legal floor that doesn't exist in the same way in Bangladesh or Cambodia.
Chemical regulation: The EU's REACH regulation restricts or bans hundreds of hazardous chemicals in textile production. Factories within the EU are legally required to comply. This is a meaningful baseline that reduces the risk of harmful substances in your product.
: European production typically means shorter distances from mill to factory to customer. Shorter distances mean lower transport emissions, though transport is a relatively small fraction of a garment's overall footprint compared to fibre production and dyeing.
Shorter supply chains
Traceability: European supply chains are generally shorter and easier to trace. Knowing where your cotton was grown is still a challenge, but knowing where it was spun, dyed, and sewn is significantly easier when all three stages are in Portugal or Italy rather than spread across three continents.
Key Certifications to Understand
GOTS (Global Organic Textile Standard)
GOTS is the most rigorous certification for organic textile production. It covers:
Fibre: The raw material must be certified organic (e.g., GOTS organic cotton, GOTS organic wool)
Processing: Dyeing, finishing, and other processing must meet strict chemical standards
Labour: Social criteria aligned with ILO conventions must be met at every stage
What it means for your brand: If a factory is GOTS certified, their entire production chain for organic products has been audited, not just their claims. Annual third-party audits are required.
What it doesn't guarantee: GOTS covers process, not product performance. A GOTS garment can still shrink or fade if the construction isn't good.
Portugal: A growing number of Portuguese factories and mills are GOTS certified. The Porto region has several certified dyehouses, which is the critical bottleneck in an organic supply chain.
Cost premium: Expect to pay 10–25% more for GOTS-certified production compared to conventional.
OEKO-TEX Standard 100
OEKO-TEX 100 is a product certification, it tests the finished textile for harmful substances. It doesn't address how the fabric was produced (labour practices, environmental impact of dyeing), only what's in the final product.
It's the most widely available certification in European manufacturing, nearly every Portuguese and Italian fabric mill has it. It's a good baseline requirement for any product but shouldn't be confused with a holistic sustainability certification.
OEKO-TEX MADE IN GREEN
A step up from Standard 100: covers both product safety (like OT 100) and production conditions (environmental and social). Less common than Standard 100 but more meaningful.
Bluesign
Relevant primarily for synthetic fabrics and technical textiles. Bluesign certifies chemical inputs, water consumption, and energy use in fabric production. If you're working with recycled polyester, nylon, or technical fabrics, ask about Bluesign certification at the fabric mill level.
GRS (Global Recycled Standard)
Relevant for brands using recycled fibres (recycled polyester from plastic bottles, recycled nylon, recycled cotton). GRS certifies the recycled content claims from input material through to finished product. Several Portuguese and Italian mills work with GRS-certified recycled yarns.
Better Cotton Initiative (BCI)
Not a product certification but an industry programme aimed at improving conventional cotton farming practices. BCI cotton isn't organic, but it involves verified improvements in water use, pesticide reduction, and worker conditions. Less rigorous than GOTS but more widely available and lower cost.
Fair Trade
Fair Trade certification for textiles is available through Fair Trade USA and Fairtrade International. It focuses on social conditions and premium payments to producers. Less common in European manufacturing (where legal labour protections are stronger) but increasingly requested by brands targeting socially conscious consumers.
Sustainable Manufacturing in Portugal
Portugal has become one of the leading destinations for brands building genuinely sustainable supply chains. Here's why:
Integrated supply chains: The northwest of Portugal has fabric mills, dyehouses, knitting mills, and garment factories in close proximity. A full supply chain from yarn to finished garment can be within 50km. This makes traceability much easier and reduces transport between stages.
GOTS and organic capability: Portuguese mills and factories have invested significantly in organic certifications over the last decade. Finding a GOTS-certified supply chain in Portugal, from yarn to fabric to garment, is now realistic for brands with reasonable MOQs (typically 500+ meters of fabric, 200+ units per style).
Water management: Dyehouses in the Douro region have faced increasing pressure from regulators and brands to improve water treatment. The better-performing ones have invested in closed-loop water systems and wastewater treatment that significantly reduces discharge impact.
Renewable energy: Portugal as a whole generates a significant proportion of electricity from renewables (wind, hydro, solar). This feeds into the factory-level carbon footprint, though you'll need to ask factories directly about their energy sources and mix.
Recycled material capability: Several Portuguese mills now offer yarns made from recycled cotton (post-industrial or post-consumer waste) and recycled synthetic fibres. If you're building a collection around recycled materials, the Portuguese supply chain can accommodate this.
Sustainable Manufacturing in Italy
Italy's sustainable manufacturing story is different from Portugal's. The country has centuries of craft tradition, which has always implied smaller production runs, skilled labour, and durable construction, all of which correlate with sustainability even before the term became mainstream.
Prato (Tuscany): Historically known for recycled wool production. The district has been recycling wool fibres from collected used clothing for over 150 years. "Regenerated" wool from Prato is genuinely circular and can be produced at significant scale.
Como (Lombardy): Silk and luxury fabric production, much of which is done in small artisan mills. Luxury production tends to have better labour conditions and more material traceability than mass production.
Italian manufacturing premium: Sustainability aside, Italian "Made in Italy" production typically commands a price premium in the market. If you're positioned at €200+ price points and can genuinely support Italian provenance, the combination of sustainability and premium positioning is powerful.
What to Actually Ask Factories
When evaluating a factory's sustainability credentials, here's what to ask:
1. What certifications do you hold?
Ask for certificate copies. Check the issuing body's website directly to verify the certificate is current. Certificates expire; out-of-date certificates mean the last audit may have been 2–3 years ago.
2. Where does your fabric come from?
A factory can hold GOTS certification but only produce some of its output as GOTS-certified. If you want GOTS product, confirm they have a certified fabric supply chain in place for your specific materials requirements.
3. What is your waste and water management practice?
Ask specifically about fabric waste (what percentage of fabric becomes waste? where does it go?), water treatment, and chemical storage and disposal. Vague answers are a yellow flag.
4. Can I audit your facility?
Good factories welcome audits, virtual or in-person. A factory that resists audit requests is worth treating with caution.
5. What is your energy source?
Some factories can tell you their renewable energy percentage or share energy bills from their electricity provider. Not all can; this is still an emerging area of transparency.
6. How are your workers paid and scheduled?
In EU factories, legal minimums apply. But ask about overtime practices, sick pay, maternity leave. The gap between legal minimum and good practice can be significant.
Realistic Cost Expectations
Sustainable production costs more. Here's a rough guide to the premium:
Production type
Cost vs conventional baseline
OEKO-TEX Standard 100 fabric
+5–15%
GOTS certified organic supply chain
+15–30%
Recycled fibres (GRS certified)
+10–25%
Bluesign certified technical fabric
+10–20%
Full organic + certified dyehouse + GOTS factory
+25–45%
These premiums are real but not prohibitive at mid-to-premium price points. A brand retailing at €120 for a T-shirt can absorb a 30% fabric premium; a brand trying to sell basics at €40 cannot.
Using NovaSupplier for Sustainable Sourcing
When you post a project on NovaSupplier (app.novasupplier.com/onboarding), you can specify your sustainability requirements, GOTS, OEKO-TEX, GRS, specific certifications, and receive quotes only from factories that meet those criteria. This saves significant time versus cold-calling and hoping the factory has what you need.
The platform covers primarily Portugal, Spain, and Italy, the three European markets with the strongest sustainable manufacturing infrastructure for independent brands.
Building a Credible Sustainability Story
Finally, a word on how to communicate your sustainability claims:
Specific claims outperform vague ones. "Made in Portugal in a GOTS-certified factory from OEKO-TEX certified organic cotton" is credible. "Sustainably made" is meaningless and increasingly a legal risk (EU greenwashing regulations are tightening significantly).
Document everything. Keep certificate copies, audit reports, supplier declarations, and factory correspondence. If a regulator or journalist asks for evidence, you need to be able to provide it.
Don't overclaim. If one fabric in your collection is GOTS-certified and the rest isn't, don't imply the whole collection is sustainable. Consumers and regulators are increasingly sophisticated.
Progress is a story. You don't have to be fully sustainable on day one. Many successful brands tell the story of where they started and where they're going. Honesty about your current position, combined with a credible improvement trajectory, builds more trust than overclaiming.
FAQ
Is "Made in Europe" automatically more sustainable than "Made in Asia"?
Not automatically. European factories must comply with EU labour and chemical regulations, which sets a meaningful baseline. But a poorly managed European factory can have worse environmental practices than a well-managed Asian factory. Certifications and audits matter more than geography alone.
Can I source GOTS-certified fabrics and have them made in a non-GOTS factory? No, not if you want to make GOTS claims on your product. GOTS certification must cover the entire supply chain from fibre to finished garment. If the factory isn't certified, the product can't be labelled GOTS.
What is the EU Green Claims Directive?
A forthcoming EU regulation (expected to take effect around 2026–2027) that will require companies to substantiate environmental claims with evidence before making them. If you're selling in the EU, you should be documenting the evidence behind any sustainability claims now.
How do I find GOTS-certified factories in Portugal?
The GOTS database () lists certified facilities. You can search by country and certification type. NovaSupplier (app.novasupplier.com/onboarding) also filters factories by certification when you post a project.
Is recycled polyester actually sustainable?
Recycled polyester (rPET) uses less energy and water than virgin polyester and diverts plastic waste from landfill. However, it still sheds microplastics in the wash and isn't biodegradable. It's better than virgin synthetic, but it's not a complete solution. Pairing recycled synthetics with filtration bags (Guppyfriend, etc.) is a reasonable approach to communicate to customers.
Next Steps
If you're building a brand with genuine sustainability requirements, the practical starting point is to define your non-negotiables (which certifications you need, which materials you'll use) before you start factory conversations.
Post your project on NovaSupplier with your certification requirements specified, and receive quotes from European manufacturers that can actually meet them.