So I was inspired by Rob Roy to make the MC of my story a member of a wealthy not!Scottish clan that used mercantile skills to gain wealth and power

I wanted them to look distinct from the other Scottish clans, but not looking English like the villain in Rob Roy. What would be a way to make them distinct? I had a few ideas:

>their tartan sashes are dyed an unusual colour that is rare and expensive (probably purple)
>most of the other clans can afford only lighter armour for the standard troops, whereas the warriors of the rich clan are bedecked out in plate and fancy brigandines