Development of systematic measurement technology for girls’ breast size based on humanistic technology
Authors: Zhao Yulin 
Published: January 2024

The breasts of young girl have dynamic changes in different growth and development stages, and the adolescence is the most important. According to nearly half a century’s research, due to the imprecise measurement standards (easily displaced breast point, blurred breast boundary) and technical methods (simple upper and lower breast sizes, with no consideration for dynamically developed breast sizes), 80%-85% of girls don’t know how to choose suitable underwear. The purpose of this paper is to establish a systematic measurement method and technology of breast sizes based on the special physiological and psychological characteristics of adolescent girls.First of all, three research objectives were proposed based on a comprehensive examination of the related studies on clothing field and medical field. The first objective is to define the breast measurement benchmark that conforms to the rigorous ergonomics theory and establish a unified breast sizes measurement framework. The second objective is to develop a breast sizes measurement method suitable for dynamic growth data integrity and establish a systematic breast sizes measurement path. The third objective is to develop a breast sizes measurement technology that combines subjective comfort and objective accuracy and establish a measurement model that conforms to humanity technology.Second, a literature review was performed based on the above research objectives. For the first objective, this thesis are sorted out and analyzed mainly from the two aspects of measuring points and measuring coordinate system. For the second objective, this thesis focuses on the advantages and disadvantages of the current measurement of breast shape characteristics, volume and asymmetry. For the third objective, this thesis focuses on analyzing the advantages and disadvantages of mechanical, digital and high-tech measurement technologies. In addition, this thesis summarized key points that can be directly adopted should be improved, and need to be supplemented.In the third chapter, for the first objective, the features and parts of the anthropometric criteria that accord with ergonomics are sorted out, to get the most suitable breast sizes measurement point. Girls in different developmental stages are selected to carry out actual action experiments according to operational definitions, to verify whether the new breast sizes measurement points are available, the stability during the process, and the deviation in identification. Then, the smallest deviation is selected as the origin of constructing the new breast sizes measurement coordinate system. According to the experimental results, a new breast sizes measurement coordinate system is established. Meanwhile, the experiment verifies the accuracy of measurement and whether the measured error results are closer to the actual measured values than those measured in geodetic coordinate system.In the fourth chapter, for the second objective, based on the newly defined breast sizes measurement benchmarks, combined with the gaps of existing methods in literature research related to measurement methods, the breast shape characteristics of girls in different development stages are divided into three types: type A, type B and type C. The measurement parameters of each type and the logical relationship between the parameters are defined, the geometric shapes of each type are fitted with the parameters and their respective volume formulas are established. After verifying the accuracy of the proposed volume formulas, a new breast asymmetry evaluation model is established according to the breast volume and breast shape characteristics, and its feasibility is verified by actual measurement cases.In the fifth chapter, for the third objective, based on the innovative design thinking of mirror theory, considering the psychological characteristics of adolescent girls in development period, a new breast shape measurement model is constructed to develop a breast sizes measurement technology that conforms to humanity technology, and according to the value proposal of the new measurement model, a wearable breast shape measurement tool combined with the new breast shape measurement criteria is developed to obtain the breast shape characteristic data. Combined with the “Growth partner” measurement applet used by the new breast sizes measurement method, the acquired breast shape characteristic data are recorded, converted, and analyzed. Finally, the reliability, effectiveness and objectivity of the value proposal proposed by the measurement model are verified by experiments.