for your c major shirt scale, why did you decide to put the actual content on the back on the shirt?
i think this is a common technique when there is a lot of readable content on a shirt. if it's on the front no one will ever be able to fully read it without the wearer patiently watching you read it. when it's on the back it is much more likely to be read, particularly by people waiting/standing in line (in a line, on line, on a line, on a queue, etc) behind the wearer. for example i think those t-shirts with tour schedules always have it on the back because it greatly increases the chances it will be read and studied by strangers, closely enough to make plans to go to the show. if the information were on the front i think it could not be studied carefully without creating a very awkward moment betweenst the viewer and the wearer