First, let me say welcome to Xmarks from Scotland.

Second...
Take the plunge and have a talk with them. Tell them about the leatherneck tartan and find accessories and shirts that will give your outfit a military feel. Tell them about the Highland regiments.
Explain that it is a part of your heritage you want to celebrate and that you feel you can make the kilt look smart and military, but be honest and say you do not want to push it if it is something they don't agree with.


Good luck with it all.