Charlie or Argyle?

[McMurdo]

As all the others haver said dreesing down a PC does not work, however with the right Argyll you can go almost anywhere provided you have the correct accessories. If you are looking for a vendor on this side of the pond you could look at the Scottish Tartan Museum or USAKilts, if you were inclined to order from Canada you could look at Cairngorm Scottish Imports they are starting a sale on Monday November 5, on ex rental merchendise.
Take a look at Arlen's post about his wedding outfit, and through the formal style thread and you will see examples of the Argyll dressed up to formal standards.
As for the PC jacket with an Argyll waistcoat, this seems to be a more modern take on things, let me just say that I am not a fan of the look, and would advise you to go one way or the other.

[Cawdorian]

IMHO the Argyll jacket with the silver buttons and vest is the way to go, the Argyll is very easy to dress up for black tie and other formal events with a tux shirt, studs and black bow tie. It works equally well for day wear. In my personal opinion a spread collar shirt looks better with an Argyll than a wing collar shirt but many wear the wing collar shirt with it.

It is much easier to order highland wear from one of our reputable merchants on this side of the water. I ordered mine from from Matt at www.scottishtartans.org you will be very happy with the quality of his merchandise. It saves you the customs and delivery hassle.