The price of kilts has been mentioned as a factor. Don't forget the cost of the jacket, etc. I wonder what percentage of Scottish men actually own a kilt? Given the infrequency of formal events, I would suspect that most just rent complete kilt outfits when needed for the occasional wedding (present company excepted), just like most men in the U.S. rent, rather than own tuxedos. (And like in the U.S. its the wedding party that more often wears them, not the guests.)

Best regards,

Jake
(Proud member of the kilt wearing minority)