Thermochromic dyes: Smart textiles: Heat Reactive Jacket by Stone Island, a tracksuit top which changes colour from black to green/ blue once it has reached 27 degrees. The fabric that is cotton nylon with thermosentive liquid crystals that react to heat.
Conductive Ink is another possible media that we could use to enable our LED lights to function. This is a new innovation that may work sufficiently on fabrics, as it would be less time consuming than hand stitching conductive thread.
Example of Fabric - Powerless Illuminating Polymer Ribbon - from Chatterbox Puppets. - Visible glow for over 8 hours. Reusable for up to four years, weather resistant- requires darkness. - Also comes in tubing, or custom resin.