Learn how to sew conductive thread onto fabric to create “soft circuits” with this detailed tutorial. From the site, “Attempts to imagine an alternate way of building circuits using fabric and thread and replacing the soldering iron with a needle. The results are washable, flexible, light and soft circuits. Possibilities endless (kind of). These circuits rely heavily on the use of conductive thread, you should consider the type of application and signal you need to transmit before trying to build anything out of thread.” Link.