In the Lewis hose line, I would prefer the medium gray vs. the charcoal gray. If I were going for the bold colorful route with that tartan I would agree with the claret. For something different, I think the Lewis hose in purple would also work quite well. Chris at Dunadd Trading Company has that color for sale.

Jock's point is well taken, they're only hose, just make sure both hose are the same color! I think most people will respect, though may not agree with, your bold use of color.

Go for it!