I usually go with General Tullius' armor and Imperial Light boots/ Bracers with a Gold Ruby Circlet. Pretty cool for a mage since you can see your hands.
If I'm feeling evil-ish, Ebony armor and Nightingale hood.
I wish I could get Tullius' Armour on the Imperial side.
If they ever do a Thalmor Dlc, I see no reason why Dovakiin won't be promoted to General. You do most of the leg work in some parts of the war.
I could see the DB being promoted to Spymaster or something of the like so they are not in the spotlight allowing future games to glance over their gender and appearance just stating that a Spymaster enabled things from behind the lines with some saying it was the Legendary Dragonborn but that is cannot be confirmed.
HOLY ****! What is this? Forged in Gods very flames! Do mine eyes tell me lies? A new Elder Scrolls game? Time is nigh, I must fly, Venture forth on my quest!