It never seems to fail. When you work every day building dry stone walls, your shirts invariably start looking like this. It's like the stones have some residue acid on them.
Batter acid perhaps?
Actually, it's just the little nibbles they try to take out of your belly every time you lift heavy stones to waist height onto the wall.
It is required of fully skilled, certified wallers, who have passed every other test, that their T-shirts must end up looking like this.
