What is "leather-jacket"

Usage examples of "leather-jacket".

And, of course, the most exploitive picture of all had to be the infamous Ghost of Dragstrip Hollow, which included music, monsters, and lots of leather-jacketed mayhem.

But it had taken no account of the black fly, the wireworm, the turnip-beetle, the leather-jacket, the green-fly and the black, the cabbage white.