Aahhha Ken. Very nice. My friend got me a set of Sharpie marker pens last year. In that set was one Laundry marker. I have not tried that one!! Now this must be good for me. What do you think? I'm also amazed that you have such a shirt that both front and back are the same!! I assume now, seeing your 'avatar' that you refer to the 'round-neck' tees as that orange one!!
Will also try the laundry marker next time I label. I hope it does not get dry keeping in the box.