2. Transfer your design to self-adhesive vinyl. Maria traced the design from the T-shirt onto clear Plexiglass with a fine point Sharpie (easily erasable with alcohol), then traced it again onto self-adhesive vinyl. This seems a bit labor-intensive to me. I’d photocopy the T-shirt, then place the T-shirt on top of the vinyl with a piece of carbon paper sandwiched in between. That way, you only have to trace the design once.
Tip: If you don’t have carbon paper, rub a pencil onto the back of the paper in the area you will need to transfer. Cover the area thickly. The pencil lead will transfer on the vinyl when you trace it from the other side.