 This review critically analyzes the current state-of-the-art and core spun-yarn textile triboelectric nanogenerators, CSY TNGS, for self-powered smart sensing applications, highlighting their unique advantages over conventional TNGS, fabrication techniques, materials used, and recent advancements in integration with self-excitation circuits, charge storage devices, and IoT-enabled smart sensing applications. The paper concludes by discussing challenges and future directions for optimization, upscaling, and commercialization of the technology.