Chinese traditional Hanfu is a kind of clothing that can reflect the changes of Chinese history, culture, and dynasties. With the improvement of people’s aesthetic ability and the pursuit of national culture, Hanfu has shown a state of revival. The study of Hanfu has become a research hotspot in today’s era. However, there is a big difference between the design of traditional Hanfu and the design of modern clothing. It not only needs to consider people aesthetics and preferences but it also needs to further consider the historical and cultural information represented by traditional Chinese Hanfu. This is a more critical and difficult point for Hanfu designers. If Hanfu cannot be well combined with history and culture, this will easily lead to a misinterpretation of Hanfu. In this study, the feasibility of the 3D simulation design of Hanfu was fully studied by combining the Internet of Things technology and the convolutional neural network method. The research results show that the Internet of Things technology can efficiently and accurately collect the characteristics of patterns, colors, shapes, and historical information of Hanfu. The reliability of IoT technology also improves the accuracy of CNN methods in predicting Hanfu eigenvalues. The largest prediction error is only 2.84%. CNN can also well capture the relationship between historical information features of Hanfu and dynasties, and all predicted feature values are within the 95% confidence interval.

With the development of VR and Internet of things and the characteristics of isomorphic block decoration, based on the two technologies, this paper comes to the realization of isomorphic block decoration in fashion design. Firstly, by analyzing the algorithm combining VR and the Internet of things, a platform based on the combination of both technologies is established. Then, the platform is applied to the same shape block decoration in different cities in the process of fashion design, and the differences in the process of fashion design are analyzed. The results of fashion design show that the isomorphic block decoration based on the combination of VR and Internet of things should be designed according to the local characteristics to promote the development of fashion design industry according to local conditions. In general, this paper provides some theoretical and practical experience for the application of isomorphic block decoration in fashion design.