How to make the Cover for a 2 sided t-shirt

 So I have been adding back design to my clothing.  I really think they give the customer more.

 But in the past, there was a small front and back window in the lower right, which you or the customer can flip to see both sides. Now all I see there says 20 percent off or whatever.

Unless it could be a Mandela effect, in which case, forget about this little message, I may have lost it.:zany_face: