Next-generation wearable systems call for flexible, breathable, and skin-friendly electronics for realizing body-worn area networks. A highly stretchable, conductive fabric with high ampacity was developed via printing coatings of phase separated PEDOT:PSS, and high performance wearable sensors and transducers have been fabricated and demonstrated, including all fabric electrocardiogram, cardiorespiratory sensors, wireless patch antenna and Doppler radar, ferroelectret nanogenerators, and electrochromic fabric displays, for personalized multi- vital signs sensing, and biometric analytics and wireless transmission.