Certifications · Sourcing Guide

Knitwear Certifications Guide for US Brands: OEKO-TEX, GOTS, GRS

Not all certifications mean the same thing — and requiring the wrong one wastes time for everyone. Here's how the major knitwear certifications work and when to ask for each.

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US brands increasingly specify sustainability certifications in their vendor requirements — but OEKO-TEX, GOTS, GRS, and bluesign test very different things. Requiring GOTS when you need OEKO-TEX adds months to your timeline and may be impossible for your manufacturer. Accepting an OEKO-TEX test report when your retail buyer wants full organic traceability will fail a vendor audit. Understanding what each certification actually covers — and what it costs in time and money — lets you specify exactly what you need, no more and no less.

Premium knitwear yarn — certified supply chain, Kiwi Giyim Turkey — Premium yarn cones sourced from OEKO-TEX certified Turkish and Italian spinners

The Four Main Certifications for Knitwear

OEKO-TEX STANDARD 100

Tests the finished product for harmful substances — formaldehyde, heavy metals, pesticide residues, pH, colorfastness. It's a product-level lab test, not a supply chain audit. Every component (yarn, dye, label, zipper) that touches the finished article must pass. It does not verify organic fiber or social compliance.

GOTS (Global Organic Textile Standard)

Certifies the entire production chain from organic fiber to finished garment. Requires at least 70% certified organic fiber (95% for "organic" label). Covers environmental criteria at each processing stage and a social compliance baseline. This is a full supply chain certification — every link in the chain must be GOTS-certified.

GRS (Global Recycled Standard)

Certifies the recycled content in a product — recycled polyester, recycled nylon, etc. Relevant if you're sourcing knitwear with claimed recycled fiber content. Like GOTS, it's a chain-of-custody certification: every processing step that handles the recycled material must be GRS-certified.

bluesign

Focuses on dyes and chemicals used in textile processing — not the finished garment, but the production chemistry. A bluesign-certified dyehouse meets strict limits on chemical use, water and energy consumption. Most relevant for knitters who also do in-house dyeing and finishing.

Which Certification to Require — and When

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If your customer asks about chemicals and safety

OEKO-TEX STANDARD 100 is what you need. It's the most widely understood certification in retail, it's product-specific (one test per article type), and it's achievable for most manufacturers within 4–8 weeks of submitting samples to an accredited OEKO-TEX lab.

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If you're marketing "organic" or "certified organic cotton"

GOTS is the standard the industry recognizes. But GOTS requires the manufacturer, yarn spinner, and fiber producer all to be GOTS-certified. You can't simply send GOTS-certified yarn to an uncertified factory and claim GOTS on the label. Timeline for a factory to become GOTS-certified: typically 3–6 months minimum, often longer. Plan well ahead.

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If you're using recycled fiber content

GRS — but verify the factory's supply chain is GRS-certified, not just that the yarn supplier is. Many knitters can source GRS-certified recycled yarns but the factory may not yet have a GRS scope certificate.

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If your DTC positioning emphasizes clean chemistry

OEKO-TEX STANDARD 100 is the most consumer-recognizable credential. For performance knitwear with functional finishes, bluesign is sometimes added as a manufacturer credential.

Cost and Timeline Reality Check

OEKO-TEX

4–8 weeks, moderate cost

Samples are sent to an accredited OEKO-TEX testing laboratory (several in Turkey). Testing fees typically run a few hundred dollars per article type. The certificate is product-specific — a new colorway with different dyes may need a new test. Annual renewal required.

GOTS

3–6+ months for factory certification

If the factory isn't already GOTS-certified, it's a multi-month process involving an approved certification body, full supply chain documentation, and an on-site audit. If the factory is already certified, you can access GOTS-certified production quickly — but verify the scope certificate covers your product type.

GRS

Timeline depends on factory status

GRS scope certificates are held by the factory and each supply chain tier. If your factory already has GRS certification, sourcing recycled-content knitwear with a claim is straightforward. If not, budget 2–4 months for initial certification.

bluesign

Manufacturer-level, ongoing

bluesign certification is held by the chemical supplier or dyehouse, not typically the garment knitter. Most relevant if you're specifying yarn from a bluesign-approved mill. Ask your factory which yarn suppliers they use and whether those mills carry bluesign approval.

What Kiwi Giyim Can Provide

We work with yarn suppliers who carry OEKO-TEX Standard 100 certification on their yarns, and we can submit finished garment samples to an accredited Turkish OEKO-TEX laboratory for product-level certification. For brands requiring GOTS-certified production, we can discuss our certification status and planned timeline — please ask at inquiry stage. We don't carry GRS scope certification as a standard offering but can explore it for orders with significant recycled-content volume. For any certification requirement, raise it at the inquiry stage — not after bulk production has begun.

Tell Us What Your Brand Needs

Whether you need OEKO-TEX documentation for a retail buyer or you're building a certified organic knitwear line, let's talk before we start sampling. The right certification path starts at the inquiry stage.

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