If you re an advanced user and want to re-program the LilyTwinkle, the ICSP programming connectors are broken out on the back.
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!