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Nordic Carved Armor requires a Smithing level of 50 and the Advanced Armors perk to create. Pieces can be upgraded with a quicksilver ingot at a workbench and also benefit from the Advanced Armors perk, which doubles the improvement.
With the aid of enchanting (fortify smithing) and pre-made enchanting and smithing potions, and of course the appropriate armor perks, you can reach the armor cap with any style or type of armor in the game, even hide and iron armor.