Remember, stealing is prohibited! If you are caught posting a variant of this skin, I will report you! (and I don't care if you put credit!)

This is a skin based off of medieval champions, a champion is someone who participated, and won (pretty important part of it, too), a tournament in which they fought close-combat in the melee, and jousted. A champion is then an icon used in ceremonies, he would be respected as a noble would be for his time as champion; but after which he would return to his normal status. The armor depicted here is the Great Bascinet covering the Bascinet, the plate armor covering the mail, the grieves over the mail also, poleyn and the iron gauntlet.

References: Plated armor, Great Bascinet, Mail, Gauntlets
Did off of prior knowledge and not very conclusive pictures: poleyn and Grieves

Just adding my research:
Watercolour, probably by Barthélemy d'Eyck, from King René's Tournament Book-- This is of the great helm

Champion
The original meaning of the word partakes of both these senses: in the Feudal Era, knights were expected to be champions of both prowess in combat and of causes, the latter most commonly being either patriotic, romantic or religious in nature. This reaches its most literal meaning in a trial by combat, in which each combatant champions the cause of one side of the trial. A "King's Champion" is appointed for ceremonial purposes at the coronation of an English Monarch, to defeat any challenger to the monarch's right to be crowned.

Early trials by combat allowed a variety of weapons, particularly for knights. These usually consisted of armor, a weapon such as a sword or mace, a lance and mount, and a shield (if the knight chose not to use his).