A quotation arrives with four logos across the header and the words "certified sustainable fabric." Under it sits a fabric you have not seen, from a mill you have not audited, at a price that suggests someone is absorbing a cost somewhere. What have those logos actually told you?
The takeaway up front: each textile certification answers one narrow question, and buyers routinely read it as answering a different one. OEKO-TEX STANDARD 100 says a product was tested for harmful substances — it says nothing about organic content, working conditions, or carbon. GOTS covers organic fibre content plus processing and social criteria. GRS covers recycled content plus some environmental and social conditions. None of them tells you the fabric is good. And a logo on a PDF is not a certification at all — the certificate number, checked in the issuing body's database, is.
The three you will meet most often
OEKO-TEX STANDARD 100 — tested for harmful substances
The most widely encountered label in textiles, and the most widely misread. STANDARD 100 certifies that every component of an article — the fabric, the thread, the button, the print — has been tested against a limit-value list for substances known to be harmful to health, and passed.
Key things to understand about it:
- It is a chemical safety test, not an environmental or social standard. A conventionally grown, conventionally dyed polyester can be STANDARD 100 certified. That is not a loophole; it is the standard doing exactly what it claims.
- It is certified by product class, graded by skin contact — the strictest class covers articles for babies and infants, and limits loosen through to decoration materials. A certificate is only meaningful alongside its class.
- Certificates are time-limited and renewed, so an old certificate number may be expired.
- Certification attaches to an article, not to a company. "An OEKO-TEX certified mill" is not the same statement as your fabric being covered.
OEKO-TEX also operates several sibling schemes that get confused with STANDARD 100: STeP certifies production facilities on environmental and social criteria, MADE IN GREEN is a traceable consumer label combining a STANDARD 100-tested article with STeP-certified facilities, ECO PASSPORT certifies chemical formulations used in production, and LEATHER STANDARD does the STANDARD 100 job for leather. If a supplier says "OEKO-TEX," ask which one.
GOTS — organic fibre content plus processing and social criteria
The Global Organic Textile Standard is the most demanding of the three, because it covers the whole chain rather than the finished article.
- Fibre thresholds. A product must contain at least 95% certified organic fibres to carry the "organic" grade label, and at least 70% for the "made with organic materials" grade. Verify the current thresholds against the standard version in force, as GOTS revises periodically.
- Processing criteria. Restricted chemical inputs, prohibition of several classes of dye and auxiliary, wastewater treatment at wet-processing units, and restrictions on accessories.
- Social criteria. Based on core ILO conventions, applied through the certified supply chain.
- Chain of custody. Every processor, manufacturer, and trader must itself be certified for the claim to hold at the end.
That last point is where GOTS claims most often break. Organic fibre that passes through one uncertified converter loses the claim, whatever the farm certificate says.
GRS — recycled content, with conditions
The Global Recycled Standard, administered by Textile Exchange, verifies recycled content and adds environmental, chemical, and social requirements along the certified chain.
- Content thresholds. A product needs a minimum of 20% recycled material to be GRS certified, and 50% to carry the GRS logo on-product. Confirm against the current version of the standard.
- It sits alongside the Recycled Claim Standard (RCS), which verifies recycled content only — no chemical, environmental, or social criteria — with a lower minimum threshold. RCS is a content claim; GRS is a content claim plus conditions. Suppliers sometimes present them interchangeably.
Textile Exchange runs several other standards a buyer will meet: OCS for organic content without GOTS's processing requirements, RWS for responsible wool, and RDS for responsible down.
The others worth recognising
- bluesign — a systems approach working at the input-chemistry and production level rather than testing the finished article. A bluesign APPROVED fabric was made from approved chemistry in an approved facility.
- ZDHC MRSL — not a certification but a manufacturing restricted substances list, widely referenced in brand chemical-management programmes. If a supplier claims to be "ZDHC compliant," ask which conformance level and MRSL version.
- Cradle to Cradle Certified — a multi-attribute product certification across material health, circularity, energy, water, and social fairness, awarded at achievement levels. A product can hold it at a modest level, so the level is the information.
- Fibre-brand programmes — TENCEL, LENZING ECOVERO, REPREVE and similar are supplier programmes with their own verification and traceability, not independent multi-stakeholder standards. A different category of assurance.
How to verify a claim in five minutes
This is the part that separates a claim from a fact, and it is quick.
1. Get the certificate number, not the logo. A logo in a PDF is a picture; every serious scheme issues a numbered certificate.
2. Check it in the issuing body's public database. OEKO-TEX offers a label check by certificate number, GOTS publishes a database of certified entities, and Textile Exchange maintains a registry for its standards. Search the number yourself.
3. Read the scope, not just the validity. A Scope Certificate (SC) states which products and processes a facility is certified for. This is where most claims quietly fail: a mill holds a GOTS scope certificate for jersey and quotes you a poplin outside it.
4. Ask for the Transaction Certificate. The control most buyers never use, and the decisive one. A scope certificate says the supplier can produce certified goods. A Transaction Certificate (TC) says your shipment was certified goods, traced through the chain. For GOTS and GRS claims, no TC means no verified claim on your order, however impressive the scope certificate looks. Agree in the purchase order that a TC will be issued.
5. Check dates and versions. Certificates expire and standards get revised. A certificate against a superseded version tells you what was true then.
What none of them tell you
This matters as much as what they cover. A certification is an assurance about chemistry, content, or conditions — not about whether the fabric will perform.
No certificate on this page tells you the GSM, the composition ratio, the shrinkage after five washes, the pilling grade, the colourfastness to rubbing, the bursting strength, the width, or whether the hand-feel matches your last order. Those come from the spec sheet and from testing, and they are what your production actually depends on. A GOTS-certified fabric can still be the wrong weight; a GRS-certified polyester can still pill on the second wash. Read the fabric spec sheet with the same rigour you apply to certificates, and verify the figures against the lot you receive rather than the quotation.
Choosing which certifications to require
Requiring everything raises your cost and shrinks your supplier pool without necessarily reducing your risk. Match the requirement to the actual concern:
- Skin-contact and chemical safety — particularly babywear, underwear, and bedding — points to OEKO-TEX STANDARD 100, at the appropriate product class.
- An organic claim on natural fibre requires GOTS, with chain-of-custody certificates, or OCS if you only need content verified. Ask which the claim rests on. Fibre properties and grades matter here too; our natural fibres guide covers what varies beneath the certificate.
- A recycled claim on synthetics requires GRS or RCS, and you should know which one you were given. Our synthetic fibres and blends guide explains what recycled polyester does and does not change about performance.
- Facility-level conditions point to STeP, bluesign, or a social audit programme rather than a product certificate.
- Regulatory direction. EU rules on substantiating environmental claims and on product-level information for textiles continue to tighten, so vague on-pack sustainability language is becoming a compliance risk as well as a credibility one. Check the current status of the relevant regulation before writing anything onto a label.
The honest framing for a buyer: certifications reduce specific, named risks. They are not a summary judgement on a fabric, and treating them as one is how greenwashing gets bought as well as sold.
FAQ
Is OEKO-TEX or GOTS "better"? They answer different questions, so the comparison doesn't resolve. STANDARD 100 tests the finished article for harmful substances. GOTS covers organic fibre content, processing chemistry, and social criteria along a certified chain. A GOTS-certified product also meets substance restrictions as part of the standard; an OEKO-TEX certified product makes no organic claim at all.
My supplier sent a certificate with their company name on it. Is that enough? Not by itself. Check that the certificate is current, that its scope covers the specific product and process you are buying, and — for content claims like GOTS and GRS — request a transaction certificate for your shipment.
Does certification mean the fabric is higher quality? No. Quality is composition, construction, weight, and finish, measured on a spec sheet and confirmed by testing. Certification and quality are independent variables, and buyers conflate them constantly.
Why is certified fabric more expensive? Audit and certification fees, segregated handling to preserve chain of custody, restricted chemical inputs, and often smaller production volumes. Some of the premium is real cost; some is scarcity. Comparing two certified quotes against the same spec is the only way to see which you are paying.
Can a certificate be faked? Documents can be. That is precisely why the public databases exist — search the certificate number yourself rather than accepting a PDF, and treat a supplier's reluctance to give you the number as the answer to a different question.
Certifications are evidence, not conclusions. Get the number, check the database, read the scope, and ask for the transaction certificate before the order ships — then match the fabric spec against the fabric reference library on Dexitex to be sure you are buying the material you meant to buy.
