Here are my preferences:

Balmoral, undiced/black,
Shirt color would depend on tartan,
Black belt/shoes (could change prference based on tartan),
Chrome buckle (could change preference based on tartan),
I think the Texas Bluebonnet tartan would be really cool, but otherwise I agree red should be in the tartan,
Red/black diced hose top, and
White spats to complement gloves.