Only a guy would rent a kilt. Afterall, getting married in a kilt would suggest that you are fairly serious Scotsman.
There is nothing wrong with celebrating your Scottish Heritage. We should all be proud of our ancestry. I just wish that if someone were proud enough of their heritage they would OWN THE DAMN CLOTHES.
Hell, when you rent a kilt you have to wear some other clan's tartan. Kind of defeats the purpose doesn't it.
Oh yeah, one more point. Let's try not to over-scottish ourselves. If your father and/or your grandfather was married in a suit and pants then you MUST be married in pants. Otherwise you are just going to be a guy in a dress.