A shirt that doubles as your password? UW researchers creating ‘high-tech’ fabrics   http://komonews.com/news/local/uw-researchers-creating-high-tech-fabrics-that-can-store-data    

“This smart fabric doesn’t need electronics or batteries, but it can encode data readable by a magnetometer like the one in your phone.”     https://www.technologyreview.com/s/609264/your-next-password-may-be-stored-in-your-shirt-cuff/