Recycled polyester is now a familiar specification in sportswear, uniforms, bags and fashion fabrics. Yet the words “made with recycled polyester” answer only one question: some feedstock was recycled. They do not tell us where that feedstock came from, how much is present, whether the finished product can be recycled again, or whether the claim has been independently traced.
The distinction matters because most recycled polyester used in textiles does not come from old garments. Textile Exchange’s Materials Market Report 2025 states that polyester represented 59% of global fibre output in 2024, that 88% of polyester was fossil-based, and that recycled polyester’s share was only 12%. Of the recycled polyester produced, 98% was still made from plastic bottles. Meanwhile, less than 1% of the global fibre market came from pre- and post-consumer recycled textiles.
Bottle-to-fibre: useful, but not a closed textile loop
In a typical mechanical bottle-to-fibre route, collected PET bottles are sorted, labels and caps are removed, and the bottles are washed and ground into flakes. The flakes are dried, melted and filtered, then converted into chips or fed directly to extrusion. Molten polymer passes through spinnerets to form filaments, which are drawn, textured or cut into staple fibre before being spun, knitted or woven.
A simplified bottle-to-fibre sequence from collected PET packaging to polyester textile.
This route can displace some virgin polymer and gives collected bottles another use. However, it is a transfer from the packaging system into the textile system. If the resulting garment has no practical collection and recycling route, its next destination may still be disposal. Calling the product “recycled” can be accurate; calling it “circular” requires much more evidence.
A circular strategy keeps products and materials in circulation at their highest value through maintenance, reuse, refurbishment and recycling. That is why durability, repair and repeated use should not be displaced by a narrow focus on recycled-content percentage. A garment that fails early is not made circular simply because its original yarn came from bottles.
What textile-to-textile recycling changes
Textile-to-textile recycling uses textile waste as the new textile feedstock. Pre-consumer sources include cutting waste, yarn waste and rejected fabric; post-consumer sources include used garments and household textiles. Mechanical recycling opens and shreds material into fibres. For polyester, suitably clean and compatible waste may also be remelted, while chemical routes break PET into smaller molecules that can be purified and repolymerised.
Each route has limitations. Mechanical opening shortens fibres and can lower spinnability or strength, so the recovered material may need to be blended with longer fibres. Melt processing is sensitive to contamination and polymer degradation. Chemical recycling may handle some difficult feedstocks and remove certain impurities, but the result depends on the exact technology, yield, energy and chemical inputs, purification burden and local infrastructure. “Chemical recycling” is therefore a process description, not automatic proof of lower impact.
Bottle-to-fibre is cross-sector recycling; textile-to-textile aims to return garments to textile production.
Why an old garment is difficult feedstock
A beverage bottle is usually a relatively controlled PET article. A garment is an assembled material system. It may combine polyester with cotton, viscose, nylon or elastane; contain sewing threads of another polymer; and carry zips, buttons, interlinings, prints, pigments, coatings and chemical finishes. Dark shades, heavy finishes and unknown use histories can complicate identification and purification.
Blends are especially important. A polyester-cotton shirt cannot simply be treated as pure PET without first separating or accommodating the cellulose fraction. Even a small elastane content can disturb some recycling routes. Fibre-composition testing, dismantling, near-infrared sorting and reliable product data therefore become part of the recycling system, not peripheral activities. Readers can connect this challenge with how cotton fibre behaves and with the many surface treatments described in Textile Finishing.
Composition, trims, colour and finishes determine whether a used garment is suitable recycling feedstock.
A buyer’s verification checklist
| Question | Evidence to request |
| What is the feedstock? | Bottle or textile; pre-consumer or post-consumer; source and collection region. |
| How much is recycled? | Percentage by mass for the product or component, not an unsupported overall impression. |
| How is it traced? | Applicable certification scope, chain-of-custody documents and transaction evidence. |
| Is it physically present? | Clarify physical segregation, controlled blending or an attribution/mass-balance model. |
| Does it still perform? | Lot-wise tests for strength, dimensional stability, colourfastness, pilling and end-use needs. |
| Can it circulate again? | Design for disassembly, compatible blends and trims, collection route and named recycler. |
Certification is valuable when it verifies the claim within a defined scope, but buyers should not stretch that evidence. It does not automatically prove that the whole garment has a lower life-cycle impact, will be collected, or can be recycled in the market where it is sold. Similarly, a laboratory result should be tied to the relevant performance requirement. The earlier article on reading AATCC TM195 moisture-management results shows why a fibre claim cannot replace finished-fabric testing.
Write the claim so it can be checked
ISO 14021:2026, published in June 2026, sets principles, requirements and guidance for self-declared environmental claims and the documentation used to support them. In practical buying language, “contains 60% post-consumer recycled polyester from PET bottles by mass” is more informative than “eco-friendly recycled fabric.” If an attribution or mass-balance model is used, it should be explained rather than presented as guaranteed physical content in every individual item.
Indian textile context
India already has significant PET collection, polyester spinning and textile-processing capability. The next opportunity is not merely to increase bottle-derived yarn, but to connect garment collection, accurate sorting, dismantling, recycler specifications and traceable fibre-to-fibre output. Export suppliers can help by recording exact blend composition, reducing unnecessary material combinations, selecting detachable trims and sharing processing information that affects recyclability.
This system view is consistent with the UNEP textile circularity roadmap, which identifies shifting consumption patterns, improved practices and infrastructure investment as interdependent priorities. The commercial question is therefore not “Is recycled polyester good or bad?” It is “What material was displaced, what evidence supports the claim, how well will the product perform, and what credible next loop exists?”
Conclusion
Bottle-to-fibre recycled polyester can be a useful transition material, but it should not be confused with a closed textile loop. Genuine progress combines precise claims, traceable feedstock, durable products, design for recovery, appropriate testing and functioning textile-to-textile infrastructure. For buyers and merchandisers, the strongest sustainability claim is the one that remains clear after every term has been defined and every document has been checked.
Sources and Acknowledgement
