Speaking about Savoy...
I have Savoy as an emergent. But Sardinia is already in game. So if Savoy emerge, there is no reason to make it again as Piemont-Sardinia.
So I did not want to give Savoy uniforms based on historical references (blue) as they would be too close to Sardinian uniforms.
Instead, I used the base meshes and textures of Sardinian (hence the front plate with a cross I did earlier, it can work for both). But I changed the colour from blue to red/white, as in the flag of Savoy