The Internet of Things (IoT) is a fast-emerging technology, which intends to transform and seamlessly connect the world by heterogeneous smart devices. The IoT influences every aspect of life and business. Various kinds of wearable devices are predicted and assumed to be an important part of IoT. To fulfil stringent requirements in terms of conformability, flexibility, and adaptability, while preserving efficiency, reliability, and robustness, the design of wearable antennas as well as RFID-enabled pervasive smart systems is becoming a challenging and widespread task. In this scenario, the introduction of novel biocompatible materials, realization techniques, and design strategies empowers the definition of well-performing wearable systems and customized RFID-oriented smart devices. Conductive fabrics, flexible 3D printed substrates, conductive nano-particle silver inks, as well as copper and textile tapes, are just few examples of innovative materials that help in realizing comfortable wearable devices and pervasive RFID sensing systems. The aim of this focused Special Session is to bring together experts all over the world to stimulate a discussion around this important and topical scientific challenge.