Abstract: A piece of clothing and a cloth structure thereof are provides. The cloth structure is used for making the piece of clothing and the piece of clothing is adapted to be worn by an object for keeping the object warm. The cloth structure comprises a surface layer, a thermal storage layer, and a thermal isolation layer. The thermal storage layer is configured to absorb heat radiated from the object when the piece of clothing is worn by the object. The thermal isolation layer is between the surface layer and the thermal storage layer and faces the thermal storage layer. The thermal isolation layer is configured to isolate heat from radiating out the thermal isolation layer.

Abstract: The invention provides a photochromic dye of a structure containing a common structure of spirooxazine series compounds and three substituents. The photochromic dye according to the invention exhibits characteristics of a high heat stability, good light fatigue resistance, high sensitivity, extremely degradation rate and the like. This photochromic dye can be formulated with suitable organic solvents and used as photochromic functional colorants under UV light excitation. Further, this photochromic dye can be synthesized and purified in simple steps with cheap raw materials and hence at a greatly lowered production cost.