How to Choose Natural-Fiber Clothing: Labels and Certifications

If you prefer natural fibers, check the garment you plan to buy rather than relying on a brand-wide slogan. Fiber content, organic certification, and testing for certain substances answer different questions. This guide explains what the label and two commonly seen textile certifications can tell you. It does not rank brands or promise that any fabric is safer for every person or use.

Start with the garment's fiber-content label

Read the fiber names and percentages on the specific item. A product promoted as cotton can still be a blend; for example, a label might list 96% cotton and 4% spandex. The Federal Trade Commission says most textile and wool products must show fiber content, country of origin, and the responsible business, although some products and materials have special rules or exemptions. See the FTC's clothing and textile guidance.

If your shopping preference is to avoid plastic-based fibers, look for the composition on each product page and package. Polyester, nylon, acrylic, and elastane or spandex are synthetic fibers. A brand's use of words such as "natural" or "eco" does not tell you the percentage in a particular garment.

What does microfiber research show?

Textiles can release fibers during washing. Synthetic fabrics contain plastic-based fibers, and cotton and wool can shed fibers too. A study that tested 37 textile samples found a wide range of fiber loss; results differed by material, construction, treatment, and wash cycle. A result from one sample is not a universal count for every garment or laundry load. Read the study on domestic laundry and textile microfiber release.

That research helps describe fiber release from the tested materials. It does not show that every synthetic garment sheds the same amount, that natural fibers never shed, or that a clothing choice will produce a particular health outcome. If reducing plastic-based fibers is your goal, check the fiber percentages and treat blended fabrics as blends.

What do GOTS and OEKO-TEX STANDARD 100 mean?

These labels cover different questions. Check the certification name and scope instead of treating one mark as proof of every environmental, health, or labor claim.

• Global Organic Textile Standard (GOTS). Version 8.0 covers textile products made with at least 70% certified organic natural fibers and requirements across processing, manufacturing, packaging, labeling, trading, and distribution. Look for the certification and complete label information on the specific product. A brand's certification or use of certified material does not by itself establish that every item in its catalog is a certified finished product. Read the GOTS Version 8.0 standard.
• OEKO-TEX STANDARD 100. This label concerns testing for harmful substances. The test requirements depend on the textile's intended use and product class, including the amount of skin contact. It does not tell you whether the fiber is natural or organic. Check the label number with the OEKO-TEX Label Check and read the STANDARD 100 scope.

A product-level checklist

1. Read the fiber names and percentages for the exact garment, including stretch panels, lining, and trim when listed.
2. Decide which question matters to you: fiber composition, organic material, testing for specified substances, or another product attribute.
3. For a certification claim, check the exact label, certificate number, product class, and scope with the organization that issued it.
4. Do not infer that a brand-wide statement applies to every style, color, size, or component.
5. Recheck the current package and product page before buying because materials and certifications can change.

For details on how FinelySourced reviews product information and lab evidence, read our review method.

Frequently asked questions

Does a natural fiber mean a garment is organic?

No. Fiber type and organic certification are separate claims. Check the product's fiber label and the certification information for the item you are considering.

Does OEKO-TEX STANDARD 100 mean a garment is made from natural fibers?

No. STANDARD 100 is a harmful-substance testing label, not a fiber-origin label. Read the garment's composition separately.

Do cotton and wool shed fibers in the wash?

They can. Studies have measured fiber release from natural as well as synthetic textiles. The materials and methods vary, so one study's count should not be treated as a prediction for every load.

Sources

• Federal Trade Commission: Clothing and Textiles
• Domestic laundry and microfiber pollution: fiber shedding from consumer apparel textiles
• Global Organic Textile Standard Version 8.0
• OEKO-TEX STANDARD 100
• OEKO-TEX Label Check