Design is related to every area including art, engineering, science, and humanics but has its focus areas alternate according to the technological advancements. The movement has been accelerated in the information era. Today design concentrates its attention to the user demands and needs rather than science and technology. Ubiquitous fashionable computer is one of the natural flows stemming from that paradigm change of the times. But even that kind of new design can`t escape from the conventional framework if the modules and WearNet, which are the hardware of UFC, are not detachable. Thus there is a need for the structural design of multi-functional clothes by utilizing reconstructable modules and detachable WearNet that`s communication route among modules. By taking advantage of detachable modules and WearNet, one can lead the infusion of next generation IT technology and fashion and open the door to a new UFC era that`s human friendly and fashionable. Thus this study set the following goals; first, to develop UFC design guidelines by reflecting the user demands and needs and using detachable modules and WearNet; second, to take a survey to identify the evaluation items for the guideline items and suggest a new UFC design to meet the user needs based on the detailed improvements; and third, to suggest a UFC modular system using detachable and thus reconstructable modules and WearNet according to the user`s taste. Chapter 4 covered the following sections of the entire design process: scenario development → concept development → design progress → prototype development → test of the integration between clothes and hardware → making UFC clothes → incorporating hardware into UFC clothes. The process of making UFC clothes was divided into clothes design and product design, and the research contents and design directions of each stage were examined in terms of technology and design. As a result, one piece of each male and female UFC clothes that could be worn on the college campus or at a conference was made using detachable modules and WearNet. The third generation UFC clothes is based on the modular system that can attach and detach modules, WearNet, and the constituents of clothes and presents the UFC design of a new concept as a flexible clothing system that can change many ways according to the situations of daily life. It`s significant that it`s a new design approach to establish a UFC design process in the viewpoint of fashion and define such UFC design elements as silhouette, material, color, and technical detail in terms of clothes and products design.