Preventing accidents during various traffic accidents and night activities requires an inclusive LED safety vest design with the concept of safety design and inclusive design. In this study, we intend to develop an inclusive LED safety vest using a wearable computer, Arduino LilyPad, and a light sensor. In addition, when developing a fashion design with a wearable computer function, the design principles and characteristics to be considered based on the concept of safety design and inclusive design were identified and a guideline for producing a wearable computer design was proposed. By applying the inclusive LED safety vest manufacturing process and guidelines derived from the theoretical background, a wearable computer hardware device called LilyPad and an illumination (light) sensor that detects the driver