Given the rather snug nature of leggings, getting the right fit is essential to wearable comfort. LikeAGlove have the solution, a pair of leggings with numerous stretch sensors that can work out your critical measurements, such as waist and thigh circumference.
The process seems to be that you get sent the special pair of leggings and you download an app. You put the leggings on, boot up the app and press the prominent button on the front of the measurement making leggings. Your measurements are captured and the app then suggests suitable clothes of the correct size.
A nice use of embedded technology to solve a dilemma facing on-line clothes shoppers. You could see this extending to the fitting of other garments such as shirts and various sports wear.