I think you look great as is. I do think the suggestion of either white or dark red hose is a good one.

I doubt you want to change your jacket buttons as the jacket is a K of C item. If you got a gold-toned buckle for your belt or used a cummerbund, you could get a formal sporran with a leather cantle like this one from Matt at the Scottish Tartan Museum http://giftshop.scottishtartans.org/sporran_fb.html. That would solve the mixed metal issue folks have referred to above.