To protect the human body from external environmental factors like rain, dust, direct sun radiation, insect access, and bites, the outer layer of clothing may lack air permeability, leading to the accumulation of wet and warm air around the body, which can cause discomfort or even overheating. Clothing with closable vents and openings have been designed to enhance air circulation in areas where significant sweating occurs. Yet, this method only enhances air exchange to a limited extent and does not completely fix the issue. The primary advantage of the future design is to provide efficient protection of the human body from different external environmental conditions, while also maintaining necessary air circulation and ventilation under clothing to minimize the risk of body overheating. The material's technical and functional features provide a strong competitive edge compared to other air-permeable materials on the market for use in the outer layer of ventilating protective clothing. The objective of the work is to analyse and optimize the aerodynamic characteristics of the material and ventilation elements that will be developed, based on the type of clothing, in order to achieve a proper balance of air permeability, mechanical, and functional characteristics for protection against external environmental factors. The work is focused on creating ventilation elements that can be fixed at the ventilation holes on the inner side of protective clothing. The attached ventilation elements can improve the structural integrity of the clothing by covering the ventilation holes and restricting dust, direct sunlight, insects, and other contaminants from reaching into direct contact with the body, at the same time it permits proper air circulation between the body and clothing. To achieve the objective, various shapes of ventilation elements are created and evaluated to determine the most effective shape. Furthermore, the shape optimization of a suitable ventilation element is achieved through the use of approximation and optimization techniques. SolidWorks Flow Simulation is used to calculate the pressure, temperature, and heat flow for the simplified elliptical model of human body with a protective jacket. The aim is to determine the geometric shape of the element that results in the least flow energy losses in the flow channel of the cell, which is demonstrated by the pressure difference (ΔP). Energy losses in the flow rise with higher ΔP, and body cooling reduces when the flow weakens or loses energy. Elements with a higher temperature difference can offer more effective cooling since the heat transfer rate increases with temperature difference. Various criteria such as heat transfer rate, heat flux, and total enthalpy rate were analysed in the following studies to evaluate the efficiency of ventilation elements and the overall efficiency of ventilated clothing.