What "Organic Cotton" Legally Requires
Organic cotton is grown without synthetic pesticides or fertilisers and, increasingly, without genetically modified seed — but growing method alone doesn't make a finished T-shirt a verifiable organic product. For the claim to hold up to scrutiny (and to EU and UK advertising standards on environmental claims), the organic fibre needs to be tracked through every processing step: ginning, spinning, knitting, dyeing and cutting. Without that chain of custody, "organic cotton" is an unverifiable raw-material claim, not a certified product claim.
Why GOTS Certification Is the Standard That Matters
The Global Organic Textile Standard (GOTS) is the certification that actually verifies the full chain of custody, alongside restrictions on dyes, chemical inputs and labour conditions at every processing stage. A T-shirt can be made from genuinely organic raw cotton and still not be GOTS-certified if the spinning, dyeing or cutting facility isn't part of the certified chain — which is why asking "is the cotton organic" is the wrong question. The right question is "is the finished garment GOTS-certified, and can you show the certificate."
Why Brands Choose Organic Cotton, and What Buyers Expect
Brands choose organic cotton for several reasons: it fits a values-led brand story, it responds to customer interest in more responsible materials, and some retail and wholesale buyers now ask for certified materials. But shoppers and buyers have also become sceptical of vague green claims, so an organic range works best when it is backed by documents and described plainly. Decide what you want the certification to do for your brand before you choose a supplier, because that determines which standard and which grade you need.
GOTS Label Grades and What They Mean
GOTS has two label grades. A product labelled organic must contain at least 95% certified organic fibres, while one labelled made with organic materials must contain at least 70%. Both grades also cover the processing, with limits on chemical inputs and requirements on social criteria and wastewater treatment at the certified facilities. Knowing the grade matters for what you can say on a hangtag: "made with organic materials" is a different claim from "organic", and the wording should match the certificate.
GOTS, OCS and OEKO-TEX: What Each One Proves
These schemes are often confused, but they check different things. GOTS covers organic fibre content and the whole processing chain, including chemicals and social criteria. The Organic Content Standard (OCS) verifies the amount of organic material in a product and tracks it through the supply chain, but it does not set the processing and chemical requirements that GOTS does. OEKO-TEX tests finished textiles for harmful substances; it does not say that the fibre is organic. A T-shirt can carry one without the others.
If you plan to make claims on your marketing, match the claim to the right certificate. Our guides to fabric certifications and sustainable fabrics for clothing brands explain how the main schemes compare.
What to Ask a T-Shirt Manufacturer Directly
Ask for the current GOTS (or equivalent) certificate covering the specific facility producing your order, not a general company-level claim. Ask whether the certification covers the full product — fibre, spinning, knitting and dyeing — or only part of the chain. And ask how organic batches are physically separated from conventional cotton on the factory floor, since cross-contamination between organic and conventional fibre during spinning is a real risk that certified facilities specifically control for.
How to Verify a Certificate
A genuine claim comes with documents. Ask for the facility's current scope certificate, which shows what the certification covers and when it expires, and for the transaction certificate that links a specific shipment of fibre or fabric to certified production. Check that the facility named matches the factory making your order. Certifying bodies and GOTS maintain public databases of certified suppliers, which let you confirm a certificate is genuine and in date. If any of this is missing, treat the claim as unproven until it is shown.
Organic Cotton Fabric Weight and Hand-Feel
Organic cotton jersey behaves similarly to conventional cotton jersey at the same GSM — it isn't automatically softer or heavier, despite how it's sometimes marketed. What changes the hand-feel is GSM, knit structure and finishing (combed vs. carded yarn, compact vs. standard spinning), independent of whether the fibre is organic. Don't assume "organic" and "premium hand-feel" are the same spec; ask for swatches at your intended GSM either way.
Choosing the Right T-Shirt Specification
Settle the spec before sampling. T-shirt fabric weights run roughly from lightweight at around 140 to 160 GSM, through midweight around 180 to 200 GSM, to heavyweight at 220 GSM or more, and the right choice depends on the look and season. Yarn type (combed or carded, ring-spun or open-end), knit structure and finishing shape the hand-feel and durability. Decide the fit, neckline and rib, collar tape, labels and any print or embroidery. Our guide to ring-spun and combed cotton shows how yarn quality affects a finished tee.
Organic cotton shrinks like any cotton, so ask for a wash test and specify pre-shrunk or compacted fabric where you need stability. See also our guide to garment testing.
What Drives the Price of an Organic T-Shirt
The main drivers are the organic yarn and fabric (certified fibre usually carries a premium over conventional cotton), the GSM and yarn quality, the audited supply chain and certification costs the factory carries, the dyeing process, trims and labels, and the order quantity. A very low quote for a certified organic product is a reason to ask what has been left out. For how these components combine, read the manufacturing cost guide.
Dyeing and Chemical Requirements Under GOTS
GOTS does not only look at the fibre. It restricts the chemicals used in dyeing and finishing, requires wastewater treatment at certified wet-processing units, and sets social criteria for the workplace. For a T-shirt brand this means colour choices and dye methods are part of the certified process, and some finishes or bright shades that are easy in conventional production may be limited. Ask your supplier which dyes and finishes are approved for your colours before you commit to a palette, and request a colour fastness test so that the colours hold up in wash and wear.
Trims, Labels and Packaging for Organic Product
A product described as organic should not undermine the claim with its own details. Choose thread, labels and trims that are appropriate for the claim, discuss packaging early, and avoid mixing certified and non-certified components without understanding the effect on your labelling. Our guide to sustainable packaging for clothing brands covers practical options for polybags, cartons and hangtags.
Starting an Organic Range at a Small Quantity
An organic range is easier to test than to guess. Begin with one or two core styles, such as a classic crew-neck tee and one seasonal option, in a small number of colours, and order a first run that lets you check fit, fabric and customer response. Our guides on low MOQ manufacturing and testing and scaling a new style explain how brands use a small first order to reduce risk before committing to volume.
Labelling and Making Claims Responsibly
Sustainability claims attract scrutiny. In the UK, the Competition and Markets Authority publishes a Green Claims Code, which expects environmental claims to be truthful, clear and backed by evidence. Use specific, documented statements such as the certificate and grade, avoid vague phrases like "eco-friendly" without support, and check any use of a certification logo against the scheme's rules before it goes on a hangtag or website. Our UK clothing labelling guide covers the basic labelling requirements.
Planning Time for Certified Fabric
Certified fabric can take longer to source than stock conventional jersey, because it must come from a certified chain and each step needs its documents. Build that into your timeline, especially for a custom colour or weight, and ask your supplier whether your quoted lead time assumes stock or custom-developed fabric. Our lead times guide shows how fabric sourcing, sampling, bulk production and shipping add up, so you can plan a launch date with some margin.
Ruhrose's Organic and GOTS Capability
Ruhrose produces jersey and T-shirt programmes through GOTS and OEKO-TEX-audited facilities as part of our Bangladesh-based production network, with full certification evidence available for any organic cotton order — so a brand's organic claim is backed by a document, not just a fabric description. Programmes can start from around 500 pieces per style and colour to test a new organic range before committing to full seasonal volume.