This is Leah Buechley. She's a PhD candidate in Computer Science at the University of Colorado in Boulder, where she "explores the intersection of computational and physical media, focusing on computational textiles or electronic textiles ... soft, flexible, fabric-based computers." In this photo, she demonstrates the use of a commercially available LilyPad Arduino system to create a turn signal built into a cycling jacket.
Leah also has instructions on building a LED tank top. Found via MAKE.