Ten Years of the LilyPad Arduino

https://blog.hackster.io/ten-years-of-the-lilypad-arduino-2f5a949f76d2

 The LilyPad Arduino was designed for e-textiles and wearables projects. It along with an accompanying collection of power supplies, sensors, and actuators share unique design with large conductive sew tabs around the edges. These allow the boards to be sewn onto fabrics, and soft surfaces, using conductive thread to build working circuits. Essentially it’s a specially packaged Arduino, a sewable computer.

 https://www.sparkfun.com/lilypad_sewable_electronics