IIT Delhi Researchers Turn Denim Waste into High-Quality Knitted Clothing: A Breakthrough with Startup Potential (Latest Tech News)

New Delhi: India produces close to 3.9 million tonnes of post-consumer textile waste every year, and only a tiny 4% of it is recycled. Most discarded clothes end up in landfills, taking centuries to decompose. Recycling is tricky because fibres lose strength during the process, which results in poor-quality garments compared to new textiles.

Researchers at the Indian Institute of Technology (IIT) Delhi have now developed a method that could change the way we look at fashion waste. Their breakthrough process transforms old denim into premium-quality knitted garments without sacrificing comfort or strength.

The team, led by Prof. Abhijit Majumdar and Prof. B.S. Butola of the Textile and Fibre Engineering Department, worked on optimising recycling conditions to protect fibre quality. They then used seamless whole garment technology to knit fabrics containing 25% to 75% recycled yarn. Tests showed that clothes with up to 50% recycled yarns felt just as soft and wearable as those made from new cotton. A softening treatment further improved the texture, ensuring consumers would not notice any difference.

Prof. Majumdar pointed out that while the research started with denim, the method could easily be adapted for other textiles. This opens the door for a new generation of sustainable fashion startups that can turn waste into desirable, eco-friendly clothing.

The findings, published in the Journal of Cleaner Production, also highlight the environmental benefits. Using data from Panipat’s textile recycling hub, the team found that denim recycling could reduce greenhouse gas emissions, acid rain, and fossil fuel consumption by 30–40%, while ozone layer depletion could drop by nearly 60%. Cotton cultivation itself contributes nearly 24% of the global warming footprint of virgin yarns — a burden that can be cut drastically through recycling.

PhD scholar Satya Karmakar, part of the team, said the researchers are now working to see if textiles can be recycled multiple times, which could pave the way for a circular economy model in fashion.

Why this is a big innovation

This research is more than a lab success — it has startup and industry potential. The Indian textile and apparel industry is one of the largest in the world, but it faces growing pressure to adopt greener practices. If scaled up, IIT Delhi’s method could inspire new ventures in sustainable fashion, especially in regions like Panipat, which is already a recycling hub.

With global consumers increasingly demanding eco-friendly products, this innovation could place India at the forefront of the sustainable fashion movement, opening opportunities for startups, investors, and policymakers to collaborate on turning textile waste into value.

This isn’t just about saving old jeans from landfills — it’s about building a future where waste becomes raw material for fashion.