How to Find Clothing Brands That Skip Synthetic Fabrics and Microplastics

Most mainstream clothing today is made at least partly from polyester, nylon, acrylic, or spandex, all of which are plastic derived from petroleum. Every time you wash them, they shed tiny plastic fibers into wastewater. Finding clothing that skips synthetics isn't about avoiding one bad ingredient. It's about learning a few fabric names and certifications so you can shop with actual information instead of vague "eco" marketing.

The fastest way to avoid synthetic microplastic-shedding fabrics is to check the fabric content label for natural fibers, cotton, wool, linen, hemp, or silk, and to look for GOTS (Global Organic Textile Standard) or OEKO-TEX certification when buying online. Brands like Pact, Kotn, Eileen Fisher, and Outerknown build their collections primarily around certified natural fibers.

Why does synthetic fabric matter?

When you wash clothing made from polyester, nylon, or acrylic, the garment sheds microscopic plastic fibers that go down the drain and into wastewater systems. Research has found that a single wash of about 6 kg of laundry can release more than 700,000 fibers, and that acrylic and polyester fleece shed considerably more than other synthetic fabrics, according to studies compiled by peer-reviewed research on textile microfiber release. These fibers are a well-documented source of microplastic pollution in waterways, since most wastewater treatment systems weren't designed to filter something that small.

Natural fibers like cotton, wool, linen, and hemp don't have this issue in the same way. They biodegrade rather than persisting as plastic particles, though dyes and finishing chemicals used on any fabric are a separate consideration.

What certifications actually mean something?

A few labels carry real, independently verified standards behind them:

• GOTS (Global Organic Textile Standard). Considered the leading standard for organic textiles worldwide, GOTS certification covers the entire supply chain, from organic fiber growing through ethical labor and safe processing, not just the raw material.
• OEKO-TEX Standard 100. This certification tests finished textile products, including thread, buttons, and trim, against more than 1,000 potentially harmful substances, and PFAS ("forever chemicals") are banned across all OEKO-TEX standards, according to the organization's own Standard 100 overview. It's a chemical-safety certification rather than a fiber-source one, so it can apply to both natural and synthetic fabrics.
• Fair Trade Certified. Addresses labor conditions and wages rather than fiber content, but is often paired with organic certifications by ethical fashion brands.

Natural fiber options at a glance

Which real brands build around natural fibers?

These are current, verifiable brands that center their collections on natural, certified fibers rather than synthetics:

• Pact. Based in Boulder, Colorado, Pact makes basics from 100% GOTS-certified organic cotton and is Fair Trade certified, according to the brand's own FAQ.
• Kotn. Sources organic Egyptian cotton directly from farmers and holds both GOTS and OEKO-TEX certifications.
• Eileen Fisher. Offers organic linen and organic cotton apparel lines and has been a long-running name in natural-fiber women's clothing.
• Outerknown. Co-founded by surfer Kelly Slater, known for Fair Trade certified factories and a focus on organic cotton and hemp.
• Toad&Co. Uses organic cotton and hemp across much of its casual and outdoor-adjacent line.
• Threads 4 Thought. Builds everyday basics from organic cotton and other plant-based fibers.

This isn't an exhaustive list, and brand practices change over time, so it's worth checking a brand's current sourcing page rather than relying on reputation alone. Some brands that were early leaders in organic cotton have shifted their sourcing mix in recent years, which is a reminder to verify certifications on the specific product you're buying, not just the brand name.

What about blended fabrics?

A lot of "natural" clothing isn't 100% natural fiber. A cotton-spandex blend, for instance, is mostly cotton but includes a small percentage of synthetic stretch fiber. This isn't necessarily a dealbreaker, stretch blends are common in activewear and denim for a reason, but if avoiding synthetics entirely matters to you, check the fabric content percentage on the label rather than assuming "cotton" on the front of the tag means 100% cotton.

A practical shopping checklist

Frequently Asked Questions

Is polyester always bad?

Not inherently unsafe to wear, but it is a plastic-based fabric that sheds microplastic fibers during washing, which is a documented source of water pollution. Recycled polyester reduces new plastic production but still sheds microfibers in the wash.

Can natural fiber clothing still contain harmful chemicals?

Yes. Fiber source and chemical safety are separate issues. Cotton, for example, can be treated with synthetic dyes or finishing chemicals. This is why OEKO-TEX Standard 100 certification is useful even on natural-fiber garments, since it specifically tests for harmful substances in the finished product.

Is GOTS certification only for cotton?

No. GOTS covers any organically grown natural fiber processed under its standard, including organic wool, linen, and hemp, not just cotton, though cotton is the most common GOTS-certified fiber in mainstream retail.

Sources

• Quantification of microplastic fibres discharged from textiles during washing, PMC
• OEKO-TEX Standard 100 official overview
• Pact: GOTS-certified organic cotton FAQ
• The Good Trade: PFAS-Free Apparel Brands