I Am a Teacher: Super Mario no Sweater is a Famicom Disk System game where you can create your own sweaters using sprites from Super Mario Bros. . Before designing, you can adjust settings like sizes. Various designs are available to put on the sweater.
The idea behind this game originated from Royal, a Japanese company that produced appliances and sewing machines, who created a program for customers to design custom sweaters. The user would send their design to Royal, which would then make a real sweater according to the design for 2,900 Yen.