Fabric is one of Japan's industrial products that are popular among foreigners. There are textiles, dyes, and patterns that have remained unchanged from long ago. Recently, new materials with excellent functionalities such as protection against the cold, drying quickly, and absorbency are drawing attention. We close in on the secret behind the development of silk underpants that can be washed in a washing machine. What is the intention behind Japan's traditional noren? We investigate the culture of Japan's unique fabrics and their appeal.