The rise of intelligent matter: Taking cues from nature to develop smarter tech

Imagine if the pullover you're wearing automatically adapted itself to the temperature, warming you if you were shivering, or cooling you down if you were sweating. This means that the pullover would have to learn to recognize your discomfort and alter its properties so as to counter this discomfort. Other potential functionalities could include rapid drying or cushioning a fall. But how can such a pullover be created? What energy would it need?