Textile waste is a growing global problem, especially at events where T-shirts are often worn only once. Sustained Collective developed a circular alternative: reusable shirts made from organic cotton, printed with bio-ink that disappears after a single wash. This allows the same shirt to be printed and used again and again.

During Op de Ring, founder Lina tested the ink’s washability, the wearing comfort, and the durability of the shirts—even under intensive conditions in the sun and with sweat. Visitors could wear the shirts, experience them, and provide feedback on the fit, appearance, and the story behind the innovation.

The reactions were positive: the fabric is comfortable, the ink left no traces when in contact with water, and the concept was seen by both visitors and organizers as a promising circular solution. Several events, such as university introduction days and the Municipality of Amsterdam, showed interest in collaboration. There was even unexpected B2C interest: visitors also wanted to purchase the shirts for private use. However, some areas for improvement emerged, such as preventing stains from sunscreen on white shirts and improving the black ink.

Based on these insights, Sustained Collective is working on new colors, refining the fit and design, and further testing washability. They are also researching the most suitable business model—renting or selling—and speaking with more organizers to gauge price expectations and willingness to adopt the product. The next test will take place at Tech BBQ in Denmark, using 40 shirts and white ink.

In collaboration with: Op de Ring and Gemeente Amsterdam.