Maybe because it's easier to focus only one thing and improving it from already existing. Considering previous ES games they did improved armors and made a new ones. Doing some thing from scratch it's totally different thing.None. I usually go with modded armor/clothing. It amazes me how someone sitting at their PC using free programs can make a better looking armor than the guys that get paid to do it.
But if I have to choose my favorite looking Vanilla armor, It's Carved Nordic Armor.
Call me weird, but I like the individual hold guard's armours the best. I tend to try and collect every cuirass and shield from every hold. I just like their pretty colours.
I would give my left nipple for a Pilium.You can keep your ebony, bury your daedric, and do away with your dragon armor.
For aesthetics, I'll use Imperial armor, especially the heavy armor with the closed helmet.
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If only they had an Imperial spear, then this picture would be complete.