This paper presents a human body communication (HBC) system design able to transmit the real-time data stream of a wearable electrocardiogram (ECG) device to a wearable photoplethysmogram (PPG) device. The proposed communication system was designed based on wet electrodes body channel measurements and was implemented using off-the-shelf components. The results presented in this paper were obtained with a system implementation using conductive fabric rather than wet electrodes as the performance were found similar. This work attempts to build a bridge between standard surface potential monitoring and smart clothing technologies. The transmission of the ECG from the chest to wrist reached an average accuracy of 97.1\% tested for three typical cardiovascular monitoring positions. This work demonstrates a fully wearable HBC system that can be considered for smart clothing technology. The effective data transfer rate was 468kbps using on-off-keying (OOK) centered at 30MHz.