A dress made from living Cordyceps militaris can regrow over a breach after it is damaged, then degrades in soil in just over 40 days. That is not a sci-fi metaphor, it is the headline claim in a Science Advances paper (DOI: 10.1126/sciadv.aed6937). The researchers also say the system can be tuned for different functions by adding specific microbes, from water repellency to UV absorption, and even biologically generated colors.

Ke Li at the Chinese Academy of Sciences and her colleagues built what they call a living textile, using the fungus itself as the structural material. They first grew Cordyceps militaris as thin filaments, called hyphae, inside spherical pellets, then washed them and placed them into molds to form a sheet. The end result is not your typical cotton-like weave. Li says it feels denser and less fibrous than cotton, closer to a soft, non-woven sheet or a flexible leather-like material, with no strong mushroom-like smell after washing, processing, cleaning, drying, and post-treatment.

So why does this matter beyond the “living dress” novelty? Because the same materials promise that normally drives waste concerns also drives product innovation: self-repair, reconfigurable properties, and biodegradability. Fast fashion and synthetic polymers are usually treated as a tradeoff: durable products today, persistent waste tomorrow. Here, the durability angle is different. The researchers are not trying to make the textile survive centuries. They are trying to make it recover function when it is damaged, because the textile remains biologically active under the right conditions.

The paper’s construction details explain how they avoid the fungus turning into brittle, rigid material. Naturally, the fungal structure is rigid, so they soaked it in glycerol, which acts as a plasticiser. Li emphasizes a key design point: they do not use a conventional fabric, polymer mesh, or other external supporting scaffold. Instead, the Cordyceps militaris mycelial pellets serve as structural building blocks, and the intertwined hyphae form a continuous, self-supporting sheet. That matters for anyone watching supply chains and manufacturing. It suggests the “scaffold” is biological and intrinsic, which could reduce reliance on synthetic backing layers, even if scaling still has to be proven.

From there, the team adds features by programming microbes into the fungal textile. To generate color, they introduced engineered yeast cells that produce orange, blue, and purple pigments, creating color biologically rather than through conventional synthetic dyes. For functional performance, they demonstrated multiple add-on capabilities. They could change the textile’s properties by adding other fungi. One example is a self-cleaning behavior, achieved by repelling water droplets. For UV protection, they added Aspergillus niger, a mould that commonly grows on fruit and vegetables. The team says this forms a dark layer on the surface containing melanin pigment, which absorbs ultraviolet radiation.

Then comes the “repair itself” part, which is the real stake for wearability and lifecycle impact. If the textile is damaged, fresh wet fungal pellets can be applied to the area that needs repair, and the fungus simply grows over the breach. Under dry conditions, most biological activity is greatly reduced, and some cells may remain inactive or dormant. But under humid conditions with nutrients present, some cells can become active again. Li frames this latent biological capacity as the reason the material can regrow and repair, while also being readily biodegradable. The researchers report near-complete visible degradation in soil after just over 40 days.

That biodegradability is also where the caveats start to matter for decision-makers. Justin Beardsley at the University of Sydney calls the dress’s biodegradability amazing compared with what is currently available for getting rid of fast-fashion waste. But he also points to the drawback that executives should not gloss over: you might not want something that breaks down while you are wearing it. In his view, it is a tradeoff between sustainability and product stability in use, because the same biological activity that enables repair and cleanup could also drive breakdown during wear.

There is a second-order implication behind his comment about real-time switching too. Because the textile is alive, Beardsley envisages one day being able to change its qualities in real time. He suggests an example where the material could be water-repellent for a while, becoming less breathable during rain, then revert to a more breathable, less water-repellent state afterward. The research team also made a practical point: so far no one has worn the dress. They treated it as a “precious display piece” and made a small size, meaning the next step is not just scientific validation, but human trials that answer basic questions like whether it behaves predictably in motion, sweat, laundry cycles, and real-world humidity.

For boards, investors, and product leaders, the strategic takeaway is simple: this is a platform, not just a novelty garment. A programmable living textile that can be engineered for cleaning, pigments, and UV absorption, plus self-regrowth after damage, would change how materials are designed, serviced, and potentially regulated. But it also forces a hard conversation about lifecycles and performance boundaries: how long it should last, what “repair” means under conditions of typical consumer use, and how regulators and customers will interpret biodegradability that is fast enough to be a selling point and potentially fast enough to be a wearability risk.