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In real life conditions, clothing drapes forming uneven clothing surface and air layer between the body and the garment. This heterogeneous air layer form may lead to heterogeneous heat exchange, such as excessive heat loss through contact area between the garment and the skin of the wearer. Therefore, the aim of this study was to evaluate and compare the dry heat loss through the garment with homogenous and heterogeneous air gap using a heated sweating cylinder. It was found that the presence of folds in the garment led to a slightly increased heat loss; however, the sizes of folds did not have any significant effect. Results from this study could be used in models of heat transfer through vertical heterogeneous air gaps. Moreover, this knowledge can be used in clothing design for protective and active sport garments.