When people talk about circular fashion, they picture garment-to-garment recycling, biodegradable fibers, or closed-loop polyester. Rarely do they think about the zipper.
But that zipper—along with every button, rivet, label, elastic band, and hook-and-eye closure—is often the very thing that kills a garment's chance at a second life. Trims are the hidden roadblock in textile circularity. And the industry has barely started to address it.
The sorting nightmare: why trims are the first bottleneck
Textile recycling starts with sorting—and sorting is still overwhelmingly manual. According to industry reports, China alone generates about 23.3 million tons of textile waste annually (2023 data), yet only 5.53 million tons are actually utilized. The rest ends up in landfills or incinerators. One core reason? Trims.
A typical jacket might have a nylon zipper with a metal slider, polyester thread, a plastic button, and a woven care label made of recycled polyester. That's four different materials in one small area. Near-infrared (NIR) sorting machines, which are the most accurate automated solution, struggle when materials are mixed within a single garment—especially when a metal zipper or thick plastic button blocks the sensor. As a result, most recycling facilities still rely on human pickers to cut off zippers and buttons by hand. That adds labor cost, slows throughput, and still misses a lot.
The consequence: garments that could be fiber-to-fiber recycled are downgraded to lower-value applications (insulation, wiping rags) or simply rejected.
The data gap: why trims are under-recorded
Most lifecycle assessments (LCAs) and sustainability reports focus on main fabric—cotton, polyester, viscose—and treat trims as a footnote. But trims can account for 5–15% of a garment's weight and a much higher share of its non-recyclable content. A single metal-tipped shoelace or a PU-coated zipper tape can contaminate an entire bale of otherwise recyclable polyester fabric.
China's national policy target (2022) aims for a 25% textile-to-textile recycling rate by 2025, rising to 30% by 2030. Yet the current real-world figure is around 20% for overall waste utilization, and the share that goes back into new textile-grade fiber is much smaller. Trims are a major reason.
EU Digital Product Passport: trims can no longer hide
The European Union's Sustainable and Circular Textiles Strategy, enforced through the Ecodesign for Sustainable Products Regulation (ESPR), will require a Digital Product Passport (DPP) for all apparel sold in the EU. The DPP must include detailed material composition—not just the main fabric, but every component down to the thread. By 2030, this will be mandatory.
What does that mean for trims? If a zipper contains 20% recycled polyester but the slider is virgin stainless steel, that must be declared. If a button is made from casein-based bioplastic with a metal insert, it must be listed. Brands will no longer be able to claim "100% recycled polyester garment" while hiding a non-recyclable zipper in the fine print.
More importantly, the DPP will penalize designs that are hard to recycle. Under the ESPR, products that cannot be easily disassembled or that contain materials incompatible with mainstream recycling streams may face market access restrictions. That changes the incentive structure for both brand sourcing teams and trim suppliers.
Design-for-recycling: the trim standard that doesn't exist yet
Several design-for-recycling guides already exist—the Ellen MacArthur Foundation's Jeans Redesign guidelines, for instance—but they focus mostly on fabric composition, rivet placement, and finish. A comprehensive "trim recyclability standard" is still missing.
What a good standard would look like:
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- Single-material preference. A zipper tape and teeth made from the same polymer (e.g., all-polyester) so the whole zipper can be recycled without disassembly.
- Detachable trims. Snaps, buttons, and labels that can be easily popped off or cut without damaging the main fabric.
- Avoid composite trims. No metal-core buttons wrapped in plastic, no glued-on embellishments with mixed materials.
- Thread compatibility. Use polyester sewing thread when the main fabric is polyester—cotton thread in a 100% polyester garment creates contamination.
Some trim manufacturers are already moving. YKK, the world's largest zipper producer, offers a recycled polyester zipper tape (part of its GreenRise line) and has committed to using 50% recycled materials by 2030. But adoption remains low because brands are still price-sensitive—a certified recycled zipper can cost 20–40% more than a standard one.
The hard numbers: why circular trims matter
According to the Bureau of International Recycling (BIR), every kilogram of textile waste that is properly recycled saves 3.6 kg of CO₂ equivalent and 6,000 liters of water. If trims cause a garment to be downcycled or landfilled instead, that entire carbon saving is lost.
Given that the global fashion industry produces roughly 92 million tons of textile waste per year (according to a 2023 analysis), even a 10% improvement in trim recyclability could save millions of tons of CO₂. That's not a small number.
Producer responsibility extension: the missing policy lever
Europe has taken the lead with the DPP, but Extended Producer Responsibility (EPR) schemes for textiles are still piecemeal. France has had a textile EPR since 2007, but it covers collection and sorting, not design requirements. The Netherlands is moving toward EPR with eco-modulation fees that penalize non-recyclable features.
In China, the 2022 policy document "Implementation Opinions on Accelerating the Recycling and Utilization of Waste Textiles" encourages EPR pilot programs, but no mandatory law exists yet. Without a legal push that makes non-recyclable trims cost more (via higher recycling fees or restricted market access), many brands will continue to optimize for upfront cost rather than end-of-life value.
What brands can do right now—without waiting for policy
Waiting for regulation is a losing strategy. Leading brands are already auditing their trim specifications and asking suppliers for recyclability data. Here are three steps any apparel brand can take today:
- Add a "trim recyclability" clause in your tech pack. Specify that all trims must be compatible with the main fiber (e.g., if the body is 100% polyester, the zipper tape and thread must also be 100% polyester).
- Request trim suppliers to provide recycling-compatibility documentation. Not just a recycled-content claim, but a statement on whether the trim can be mechanically separated or chemically recycled together with the main fabric.
- Pilot a take-back program that tracks trim issues. When you collect used garments for recycling, make a note of which types of trims caused rejection. Share that data back with your sourcing teams.
Conclusion: trims are the last mile of circularity
The fashion industry has invested heavily in fiber recycling, but the loop will never close unless trims are part of the solution. They are the last mile—small, numerous, and stubborn. But with the EU Digital Product Passport on the horizon, with rising carbon costs, and with recyclers demanding cleaner feedstock, the pressure on trims is only going to grow.
The brands that start designing for trim recyclability today will be the ones that can credibly claim a circular product in 2030. The rest will be stuck explaining why their "100% recycled" jacket still ends up in a landfill.
FAQ: Trim recycling in circular fashion
Can zippers and buttons be recycled?
Yes, but only if they are made from a single recyclable material (e.g., all-polyester zipper) and detached from the garment before recycling. Most current recycling systems require manual removal, which is costly.
What is the Digital Product Passport?
A mandatory digital record for every garment sold in the EU, required by 2030. It must list the material composition and recyclability of every component, including trims. Non-compliant products may be restricted from the EU market.
How can small brands afford recyclable trims?
Recyclable trims currently carry a 20–40% cost premium. Small brands can start by choosing mono-material designs (e.g., all-polyester zippers) where practical, and by joining industry coalitions that pool demand to negotiate better prices.
