So glad this thread ( no pun intended) got started since I have the same problem with many of my tees, some of which are fairly new. I also thought of the seat belt being the culprit but another thought is since I never tuck in my tees I thought maybe the rough corners where the snap or button is on the waistband. On the other hand, I have numerous shirts that I've had for some time and don't have that problem. Makes no sense.
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