Guild Wars 2

http://wiki.guildwars2.com/wiki/Mystic_forge

Ok, I read on the wiki that you can get recipes for armor by making armor boxes at the mystic forge, but you can’t use karma items or world drop items. So, I wanted to know if I could buy a T3 racial chest piece and use that in the mystic forge as its costs money, not karma. Would I be able to do this?

From what I understand it has to be a craftable armor piece.