Japanese Dr. Pepper T-ShirtCharles C. Alderton introduced a pepper style soda named Dr. Pepper in Waco, Texas in 1885. Dr. Pepper was introduced nationally in 1904 at the Louisiana Purchase Exposition as a new kind of soda pop, and it became popular in countries around the world, including Japan. Everyone will know you are a fan of the soft drink made with 23 flavors when you wear this Japanese Dr. Pepper T Shirt.