It is known that the functionality of the product is determined by its structure, namely the textile structure, the constructive solution, the processing technology. The present paper concerns the aspect of the reasoned constructive functional design of the post-operative bra type products. The methods used to refer the matter included researches in the field using the specialized literature, patents, scientific articles, discussions with colleagues and specialists in related fields, as well in the medical field. The paper presents the results of the analysis of constructive statistical parameters of post-mastectomy bra type products, comparative analysis of the values of the constructive parameters of the patterns with the dimensions of the mammary gland and external breast prostheses. The actuality of the theme is determined by the lack of researches that would be the basis of the functional constructive design of the clothing products intended for women with amputations of the mammary glands. The work aims to identify the design method of bra products that allows the adaptation of the construction algorithm to the requirements and the characteristics imposed on the post-operative bra product and the development of the custom design algorithm. For the constructive parameters specific to the studied product, the statistical parameters are calculated. The results obtained are summed up by analyzing them in the form of graphs The study includes the identification of the initial data that need to be included in the design algorithm of the construction of the basic printing for main elements of the post-operative bra. The results of the study, the elaborated design algorithm will be used to elaborate the constructions necessary for further experiments.