I thought about that. Then I thought about the plethora of O/P tin cans we'll be fighting and decided to add a "heaviest" gear set should we need it. 
Not necesarry at all, the heaviest samurai set is already very heavy, you really dont need anything heavier than that and the black armor would look shit for a samurai, and anyone in general.
Good luck, I don't mind samurais in this game and I love that there is a new dedicated clan for them. Hopefully you'll keep true to the style so that you actually are unique.