Chameleon Scarf...
Adafruit, which posts the geekiest, most wonderful... ...own "chameleon scarf," an accessory that changes color to match your clothing. The scarf itself is incid... ...se what blew my mind is a sensor that detects the color of an object -a piece of fruit or the shirt you'r... ...wearing- and matches its RGB c...
https://www.neatorama.com/2013/05/22/Chameleon-Scarf/
