What is recycled polyester in fashion?
Polyester fibre made from recycled plastic, most often bottles, or from textile waste, instead of from virgin fossil feedstock.
In short
Recycled polyester is polyester fibre produced from recycled sources, mainly plastic bottles and, increasingly, used textiles, rather than from virgin petrochemical raw materials. It performs much like virgin polyester and is widely used in activewear, outerwear and linings.
How does it work in practice?
In mechanical recycling, collected plastic is sorted, cleaned, shredded and melted into pellets that are spun into new fibre. Chemical recycling breaks the polymer down into its building blocks and repolymerises it, which can handle more mixed or coloured inputs and supports textile-to-textile recycling. Brands typically specify recycled content in the BOM and request certification and transaction documents to verify it.
Why does it matter for fashion businesses?
Polyester is a dominant fibre in fashion, so changing its source has a significant influence on a brand's material footprint and sustainability targets. Retail partners and consumers increasingly ask for recycled content. At the same time, claims are scrutinised: bottle-based recycled polyester takes material out of a food-packaging loop rather than closing a textile loop, and it does not address microfibre shedding. Wording on product pages and hangtags needs to be precise and supported by evidence.
- Request chain-of-custody documentation for recycled claims
- State the percentage and source of recycled content
- Avoid implying the product is fully circular when it is not
How is AI changing it?
AI-supported sorting systems use near-infrared and visual data to identify fibre types in post-consumer textiles, which is a key bottleneck for textile-to-textile recycling. Traceability platforms use data matching to check certificates and shipment records. Design tools can flag blends that are hard to recycle and suggest mono-material alternatives.
Common pitfalls
Typical risks include unverified recycled content, mixing recycled polyester with elastane or other fibres that hinder future recycling, and marketing claims that overstate the benefit. Keeping documentation and using specific, factual language reduces the risk of greenwashing accusations.
Frequently asked questions
Is recycled polyester better than virgin polyester?
It avoids using new fossil feedstock and can lower some environmental impacts, but it is still a synthetic fibre that sheds microfibres. Whether it is better overall depends on the source and process, so claims should be specific.
How can a brand prove recycled content?
Brands usually rely on third-party certification and chain-of-custody documents that track recycled material from the recycler through spinning and fabric production to the finished product.
