Nemean Lion's Pelt

The Nemean Lion's Pelt is a magical Spoil of War currently owned by Percy Jackson. Although in ancient times it remained a lion's pelt, in modern times it becomes a bulletproof and generally weapon-proof leather jacket.

Hercules
The Nemean Lion's pelt was once worn by Hercules in ancient times. Little is revealed about what he did with it. The pelt later returned magically to the Nemean Lion once the monster was recreated by the usual process.

Percy Jackson
Percy Jackson later won the pelt after defeating the lion in the Air and Space Museum. it proved useful to him several times, and it was also quite fashionable, according to Thalia.

Gods
Percy later burnt the pelt in a sacrifice to the gods. it is unknown whether they recieved it, it burnt, or it returned to the lion itself.