Take traditional fallen armour: cuir bouilli over mail.
I use that together with a klapvisier and it looks mean.
In case that he wants to use Rus Splinted Greaves - I would say the cuir boulli doesnt fit so good.
Take some of the armors what bosco said.
I would take the Kuyak (I own both light and heavy).
Kuyak is one of the best looking armors in the game. It has a great model and a high lvl of detail. It fits to nearly everything.
Many helmets can be used with it, and also all gloves, shoes and especialy all kind of weapons - 2h, pole, 1h and shield and so on.
Theoretically I want a high protection outfit to act like a "tank" to take advantage of my high HP.
Take the heavy kuyak. gives good protection.
And if you think you need more then perhaps a Transitional Armor could be used.
It looks also great with a Klappvisier, I sometimes use the same combo.