One of the issues I felt reduced immersion in Skyrim was the armour.
Everywhere in the game the people wore suits of armor which matched the setting - that of a Norse period. Fantastic suits of realistic-looking leather armor, hide armor and various mail and plate armor.
However, there was one glaring misfit in the game regarding armor, and it was the player him/herself!
All the best looking armor sets were soon left behind (or never worn at all) as the player moved through the more powerful armor sets such as dwarven, elven and then obsidian and daedric.
Meaning that whilst everyone else fit perfectly into the Norse genre, my fighter character never did. Perhaps the worst example was the suit of dwarven armour which left my character looking like a gilt-colored clock that used to grace the mantlepiece of my grandma's house.
Please, can we not have single sets of armor per material as before. Instead, I feel it would be a great idea to have armor designs in the game. This would mean that any smithing character could find/buy designs (or even purchase them from the marketplace).
Therefore when you make a new suit of armor, you choose the design for that suit from your existing list of armor designs. That way you have control over how it will end up looking.
The Skyrim plate armor was an outstanding-looking suit of armor, and I very much missed it when I felt I had to move on to the stronger suits of heavy armor.
As an additional idea I feel that the material used to make the suit could influence the overall color of the armor, or perhaps the color of filigree within the artwork on the armor.
Best, John