It's a snood made into a jacket by the missus. He has to wear it to protect this. Dopey little ****er ripped his chest open 2 days before Xmas.
When he did it I couldn't find anything. Went back the next day. Saw this. And then saw this a foot away. It's an old gabion (metal cage filled with stone to shore up the river bank) that's been washed away and partially buried. It's not there now, went back the next day with my bolt croppers