But, after it's all over and they live happily ever after, in 10 years time they'll have a bloody good laugh (in a nice way) at how cracker daft she looked.
Sometimes when I look at my wedding I do wish I'd been a bit less traditional and done something wierd and ultra fashionable. OK maybe not the purple hair extensions, but a strange dress or something. I could wear mine tomorrow and it would still look 'nice'.
So I guess I'm saying don't chance your friendship over it, say something in one of the many kind and girlfriendy ways suggested, but be there to laugh at the photos in 2012...