The clothes can be anything really, just some celt/greek inspirations may influence their fashion. Some people may have more intricate marking on their faces (I'm just to lazy to create very complicated ones). Also, people from the Noctis Order are able to dye their hair although this is more a young person's fashion the older members don't really see the point in dying their hair.
Have any questions, just ask!
I'll draw some like evening formal wear at some point! And more information may come about