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Research and apply 3D simulation technology to create underwear products on the 3D Clo software, thereby analyzing the data collected through a survey in Ho Chi Minh City and an online survey. The topic assesses customer satisfaction through 3D simulated product quality factors, actual product quality, product design, brand value, thereby proposing solutions to improve customer satisfaction. Brand positioning for small lingerie brands in Vietnam. The main body of the thesis consists of 5 chapters: The first chapter is an overview chapter of the research including the current situation of the garment and fashion industry, a number of domestic and foreign studies related to the topic, the reason for forming the topic, the object, and the scope of the research. research, research methods. The second chapter is the chapter on a theoretical basis, the author introduced 3D simulation technology, brand, and brand positioning. The third chapter is about experimental design, material selection, product simulation on 3D, technical preparation and actual product implementation, comparison of 3D simulated products and actual products. The fourth chapter is the chapter that introduces the research method, introduces the research process, builds the scale, the survey sampling method, and the data processing method. The last chapter presents the research results, from which solutions and conclusions are made. The author adopts the brand value in the garment industry to provide a brand positioning solution and measure the impact of 3D simulation technology in brand reposition. 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