There is little information available on the history of the God Robes, but they are most likely ancient as they are said to have slept hidden for thousands of years prior to the events of the Asgard arc. It is however interesting to note that the Siegfried of legends, ancestor of the current God Warrior, did not wear a God Robe when he defeated the dragon Fafnir during the Age of Myth. One could therefore conclude that the Robes were crafted sometime after that, maybe during the Age of Men. Who created them also remains a mystery.