As electronic sensors become more prevalent, which piece of apparel can now be purchased with the "smart" prefix?

Smart diapers, made by Pixie Scientific, are disposable and instantly analyze "data" they receive, as they search for signs of urinary tract infections, dehydration, and developing kidney problems. The idea, the company states on its website, is not to create a new device, but to integrate technology into daily life in an unobtrusive way.