Thank you very much OP!
My normal casual uniform of the day is a Tee shirt and dungarees. Been that way since about 1966.
Many of my Tees are pocket type but I still have plenty pocket less and those new ones with no tags and very light printing in the back you spend a little time to get right. A couple washes and its disappeared for the most part!
My solution is a marker line down on the bottom front, no one sees it and it makes it a lot simpler for a 1/2 awake senior get going.
Wow its nice to see I'm not the only curmudgeon here with that problem.