I see nothing wrong with your choice to wear this tartan. I'd suggest getting it in the best kilt you can afford--don't go cheap on it--you'll thank yourself later.

I'm a descendant of a 'splt' family during this conflict. My paternal GGGranfather fought for the CSA in the 31st. Virginia and his first cousin fought for the USA in the 15th. West Virginia. I designed a tartan and proudly wear this kilt to honor both sides. Of course there is a blend of blue and grey in it. It's on the Scottish Register of tartans #10127 if you're interested in checking it out.