A multi-model pore system, which includes the micro, meso, macro and mega pores, develops between fibers, yarns, fabrics or multilayer fabrics and human body respectively during wearing clothes. This multimodel pore system significantly affects thermodynamic processes of human and consequently the thermal wearing comfort of outdoor and protective clothing. The objectives of the research are to analyze this effect and to develop application-oriented principles and processes for the holistic simulation of outdoor clothing according to geometrical, textile-physical, and thermal parameters. To achieve the required aim clothing samples for five selected test persons are developed and sewed and the textile materials are comprehensively characterized. The size distribution of the mega pores are identified by the fit simulation and the wear trials are conducted in climate chamber to analyze the heat transfer between body and clothing system. In this paper the thermal simulation of the jacket and test person1 is presented. This innovative approach will give the opportunity to analyze the effect of body shape, design of clothing, environmental conditions and level of activity of human.