Gordy:
I had the same argument, when I got married in the kilt.
I had my first argument with my then-to-be mother-in-law about the Sgian Dubh (skee.an doo).
It may well have been that wedding example that was referenced, because they asked around to garner support, and finally heard from a CO that it was ok
Personally I didn't care whether or not the GB disapproved - ye canny get wed half-dressed!!! (well, you know what I mean).