For me personally I think the Nord ancient armors look great (as it seems many people think as I've seen many posts mentioning this and I've noticed many still wear the armor even though it is lower level).
The Nord iron & steel armors to me look good. Wolf armor looks great as does the dragon Plate (except the helmet which just doesn't go)
The guard armors and the Stormcloak armors look great.
The armors such as Steel plate & Ebony which we've seen in previous TES games across Tamriel and I'm guessing is more of an Imperial design (Imperial Steel plate in previous games and ebony mining and trade controlled East Empire Company) both also look fantastic.
Is it just me or did they seriously not do justice with the three mentioned in the title. There is so much potential, armor they could have made being a Norse / Viking mythological inspired realm. Where is the Nordic chain mail and ring mail, they were so famous for in revious TES games?? What about trollbone armor?