Okay so, this isn't even a full body drawing, but it was a pain in the butt to tag anyways. According to the Fullmetal Alchemist wiki article about Xerxes they state that, "Judging from the architecture, style of dress and cultural similarities, it is more than likely that Xerxes is based on the civilization of the Persian Empire." So I was pretty much lost about how exactly describe what Al's wearing, since I couldn't find any tags related here. Finally, I opted for (and I really understand its ambiguity) traditional clothes + robe. I did my best. X(