Knitwear Certifications Explained: BSCI, SEDEX, Oeko-Tex, GOTS and GRS

By YZR Sweaters · 2026-09

Buyers new to sourcing knitwear quickly run into a wall of acronyms. Suppliers list BSCI, SEDEX, Oeko-Tex, GOTS, GRS and RWS as if they were interchangeable. But these standards answer completely different questions, and confusing them leaves gaps — a supplier can hold an impressive-looking certificate and still fail the requirement your retailer is asking about.

Why do buyers ask for certifications at all?

Requests usually come from three places: your own brand values, a retail customer's supplier code of conduct, or a legal requirement in your market. Each points to a different kind of standard — social pressure (hours, wages, safety) is the territory of social audits; product safety (chemicals on a garment that touches skin) is product testing; material claims (whether "organic cotton" is genuinely organic) is chain-of-custody certification.

What do BSCI and SEDEX actually certify?

Neither is a product certification, and this is the most common misunderstanding among first-time buyers.

amfori BSCI (Business Social Compliance Initiative) is a social audit programme run by amfori, a Brussels-based business association. Factories are audited against a code of conduct covering working hours, wages, child labour, forced labour, health and safety, and freedom of association. The audit produces a rating rather than a pass or a certificate to hang on a wall.

SEDEX (Supplier Ethical Data Exchange) is the platform; SMETA is the audit methodology used on it. They are not the same thing, though people say "SEDEX audit" as shorthand. A SMETA audit covers labour standards, health and safety, environment and business ethics. Both audit the workplace — neither tells you what is in the yarn.

What does Oeko-Tex test for?

Oeko-Tex is a testing and certification system aimed squarely at product safety. It covers several programmes:

• Standard 100 — the best known. The finished article is tested for harmful substances, with limits varying by how closely it touches skin; baby articles face the strictest limits.
• ECO PASSPORT — certifies textile chemicals and colourants.
• STeP — assesses production facilities on environmental and social criteria.
• Made in Green — a consumer-facing label linking a product to a certified facility.

For knitwear, Standard 100 is usually the relevant one. It certifies a tested article or article class, not the factory, and it is issued for a limited period — so check the validity date and that the category matches your sweater.

What do GOTS, GRS and RWS verify — and how are they different?

These three sit in the chain-of-custody family: they verify a fibre claim and trace it through processing, with third-party certification of the whole chain rather than just the final factory.

• GOTS (Global Organic Textile Standard) — covers organic fibre content plus environmental and social criteria in processing. A full processing standard, not only a fibre claim, with strict rules on allowed inputs.
• GRS (Global Recycled Standard) — verifies recycled content and adds social, environmental and chemical requirements. Typically used for recycled polyester and recycled wool blends.
• RWS (Responsible Wool Standard) — addresses animal welfare and land management on the farm, and traces certified wool from farm through supply chain.

The practical consequence: a yarn can be GOTS-certified and the sweater still cannot carry a GOTS claim unless every step, including knitter and finisher, is certified. Buyers who need a material claim must raise it before yarn is purchased. Our overview of recycled and organic knitwear fibres explains how these materials behave in production.

Which certification should you ask for?

Match the standard to the requirement rather than asking for everything. If a retail customer sent you their code of conduct, they will usually accept BSCI or SMETA — ask which audit type and what minimum rating. If you are worried about chemicals and product safety, ask for Oeko-Tex Standard 100 on the relevant article class with a current validity date. If you are making a fibre claim on the label, you need GOTS, GRS or RWS covering every stage in your chain.

If you simply want assurance the factory is genuinely audited, a social audit plus willingness to host your own visit covers more ground than a certificate alone — see our guide to preparing for a factory audit. And if your market has its own rules, those are legal obligations rather than voluntary standards, covered in our notes on EU sustainability rules for knitwear.

How do you verify a certificate is real?

Certificates are easy to photograph and easy to misattribute. Check the company name and address against the supplier you are buying from — a certificate issued to a different legal entity is not evidence about your supplier. Check validity dates and product category, verify with the issuing body where a public database exists, and ask which production site is covered. For material claims, documentation beats a scan — our overview of sweater lab testing explains how verification works in practice.

How do certifications fit into a knitwear order?

Certification is a sourcing constraint, not marketing decoration. If you need a certified fibre, say so before sampling — the yarn choice drives available colours, lead time, cost and minimum quantities. If a retail customer requires a specific audit, confirm the audit type and rating before committing to a delivery date, and put the requirement in writing on the purchase order.

At YZR Sweaters we work with partner factories that hold BSCI, SEDEX and Oeko-Tex certifications and welcome audits, and we support both full inspection and third-party inspection through firms such as SGS and BV. We would rather tell you plainly which standards our partner factories hold and how to verify them than list acronyms you cannot check.

Frequently asked questions