for that you must stop trying to read your tshirt during taking photo, but try to read it after taking the photo, by looking at the photo on your phone.
if you try to read your tshirt during taking photo, then first of all your neck is gonna hurt, plus you wont be able to show your face to the screen ,which is the goal of taking a selfie in the first place.
and when you look at that photo, if you see that the letters are reversed in your photo, and you can not read your tshirt, then you can start to follow this thread from the beginning again, have a fresh start, read the solution, which is solved now.... then you will be able to read your tshirt even after taking photos... which is good thing...