Wearable computing systems and applications have been attracting researchers and practitioners from a mix of interdisciplinary disciplines for many decades. The proliferation of wearable computing from smartphone and smartwatch based systems to on-skin interfaces and implantables have been fuelled by the advances in the underpinning technologies and the growing consumer acceptance. However, despite the fast growing maturity of wearable computing, there are still many important research challenges that need to be addressed, including but not limited to novel hardware and platform design, energy and computing efficiency, security and privacy, adherence and user experience. The goal of this workshop is to provide a forum for an interdisciplinary mix of researchers, developers, designers, manufacturers, and users to exchange novel ideas, innovative solutions, and present results from real-world case studies in the area of wearable computing.