A. Peter got it from the Devil. If you think that’s improbable, then you’re probably not insane or at least not severely deluded. B. When Peter put the belt on he transformed into a wolf, so there you get a wolf wearing a belt. Kind of silly. C. When Peter took the belt off, he turned back into a human, as if a wolf had hands with opposable thumbs to undo a belt. You can see such transformations in films without magical belts. Special effects don’t need magic. In real life transforming into a wolf would be physically gruesome; however, you are not likely to meet up with Peter Stumpp since he was dismembered and beheaded in 1589.