subTextile is a toolkit for behavioral textiles: the intersection of on-body computation and electronic textiles focusing on the interactive capability of electronic textiles. It provides a powerful visual programming language and hardware platform specifically designed to create complete behavioral textile systems. Using a rich, goal-oriented interface, subTextile makes it possible for technical novices to explore electronic textiles, while providing open-ended expandability to experts. As e-textiles mature, better tools and techniques are needed by artists and designers experimenting with these new materials. The subTextile project was created to support cross-pollination between technical and design disciplines in the hopes of fostering greater creativity and depth within the field.