We consume tremendous energy in heating, ventilation and air conditioning (HVAC) energy. From the perspective of energy efficiency, localized heating/cooling of individual persons is much more efficient than heating/cooling of the whole room space in the buildings. Therefore, textile could be one of critical solutions for HVAC enegy savings which leads to sustainability and carbon neutrality. Along this line, numerous thermoregulation researches on smart clothes for human thermal comfort have been explored through optimization of heat transfer in textiles in an active or a passive way. In this presentation, we introduce our recent achievements on smart fabrics, which are composed of polymer metamaterials with selective radiation transfer for efficient thermal management such as raiative cooling.