If you can remember the '70s, you weren't really there, ha.

I was wearing a kilt out and about in Canada in the '70s. I was married wearing my McGregor in '77, so it's up to you. Keep a straight face, nobody can really challenge you on it. Heck, in the early '70s a lot of people weren't wearing anything at all: Mama Lion, Grace Slick, Jim Morrison. So it gets even scarier, remind them of that and they'll welcome the cilt.