LilyPad is a wearable e-textile technology developed by Leah Buechley and cooperatively designed by Leah and SparkFun. Each LilyPad was creatively designed to have large connecting pads to allow them to be sewn into clothing. Various input, output, power, and sensor boards are available. They’re even washable. Button closes when you push it and opens when you release (momentary push button).
Resources

Schematic

Eagle Files

Hookup Guide

GitHub(Design Files)

LED Butterfly Pop Up Card Project

Light-Up Valentine Cards Project

LED Robot Pop Up Card Project

Light-Up Plush Project