Quote Originally Posted by robthehiker View Post
Even though you'd be a bit overdressed it would look fine. I don't believe the "unkilted" equate the pc with a tuxedo - they see it as a kilt jacket.
I think you are incorrect on this account. It is impossible to hide a PC's formality, from the cut, to the tails and don't forget it is worn with a formal shirt and tie.

My advice is to wear your green argyle, even though you won't be wearing your kilt of choice. Unless the invitation calls for the guests to be in black tie it would be a bad idea for you to show up in a PC. While you are an invited guest, you must remember that the focus of the day should be the bride and groom. Dressing inappropriately takes away from their spotlight and shows a lack of respect for the couple.