solution
For this, the back of the T-shirt, I designed what could be described as a kind of information graphic. The shape in blue outline is a map of the Black Sea, and the cross-hair shows the location of the ship for the eclipse event. I developed the "diamond ring" image that surrounds the map from a photo taken of that eclipse. I reduced the photo to something that could be printed using only black, white, and red ink while allowing for the vagaries of registration when using silk-screen on fabric.
The concept and design is 100% my own. I used Corel Draw to develop the graphic.