Hi I'm a SEA player you can wear all of them a get all the stat...:-) this stat was implemented when people rage how hard RMH in SEA. Other than this upgrade on costume they also implemented a auto BUFF once you enter COA hard at the same if im not mistaken its add 3000hp... well let's see if this will come on NA...:-)
Probably never, they still need to make money out of pandora keys, spinels and explorer potions.