This paper presents a simulation environment for the education of clothing thermal function. It allows learners in a virtual environment to learn the clothing thermal comfort theory and identify the most important factors that influence clothing thermal functional performance. The virtual wearing case is defined with primary parameters and the numerical simulation results are visualized with 3D virtual environment and 2D animation, which provide virtual reality based interpretation of the thermal state and the dynamic thermal processes of the human-clothing system. This system can also be used as an effective visualization tool by textile researchers.