Wearable devices have become increasingly attractive in wearable electronics due to their advantages of environmental friendliness and foldability. The state-of-the-art thermoelectric system depends on inorganic semiconductors that show high electron mobility but lack mechanical stability and thermoelectric performance. Here, We have proposed a solvothermal method to grow Ag2Se/Ag2S nanocomposite on carbon fabric with outstanding properties, demonstrating excellent flexibility. The crystallographic analysis was performed for all samples through XRD and confirmed the orthorhombic Ag2Se and mono-clinic Ag2S. Further, the morphological analysis revealed the enhanced growth on the carbon fabric. We investigated the thermoelectric properties of Ag2Se/Ag2S nanocomposite and achieved a high power factor of 8.1 μW/mK2 which is twice as high as the percentage of the pure Ag2Se. Additionally, thermoelectric legs were fabricated using Ag2Se/Ag2S nanocomposite in a 2-pair module. They produced an output voltage of 0.1 mV to 7.4 mV at a temperature gradient (ΔT) of 3–8 K. This work is a promising approach for obtaining high-performance wearable thermoelectric device.