Fat guy in a little jacket!

[SteveB]

An Argyll would be appropriate at the wedding. Usually the PC is on the groom. A Piper looks grand in a Braemer of such colour as goes with the colours in the kilt.

Slainte

[shawhighlander]

These are all good answers!
Just as a matter of course, the jacket of a Scot's attire traditionally fits more snugly than an American sport coat...that being said, I would choose the one that is most comfortable to you.

And, remember that when holding the pipes you will need the jacket to accommodate the movements thereof ith:

[Jack Daw]

And, remember that when holding the pipes you will need the jacket to accommodate the movements thereof ith:

How I have learned the truth of this statement!

As a piper, I wear whatever level of formality is expected. I've worn my PC jacket for piping at semi-formal Rabbie Burns Suppers, but never during the daytime. I don't have a piper's doublet, but I have a Patrol Tunic (See Burnetts & Struth) for a pseudo-military look day or evening.