I am a teacher: Super Mario Sweater is a knitting pattern-designing game released for the Family Computer Disk System on August 27, 1986, only in Japan. Players would input their measurement sizes and design sweaters, adding pictures of famous characters such as Mario, Luigi, Peach, and Bowser in the process. It was devised by Royal Industries Co. Ltd., a Japanese appliance and sewing machine company. It is the first of two textile games of the Super Mario franchise, the other being Mario Family on the Game Boy Color. 

Royal Industries Co. Ltd. realized that it could profit from a sweater-design program, which led to the development of this game. The company eventually made a real-life version of the game