I know the gentleman that addresses the haggis at our St. Andrews dinner always wears his dirk with his PC, but that's a little different I guess.
You could just wear your claymore across your back and then draw it dramatically at the proper moment, reminiscent of "Braveheart". Don't forget to yell, "FRRRRREEEEDDDOOOOMMMMMMMMMMMmmmmmmmmmm"