My wife and I are flying to Washington State to have our son christened by my father in law (who is a minister there). I am planning on wearing my Irish National tartan kilt and my wife a skirt in the same tartan, and getting a small sash for the little one as well.

My only dilemma is this: I don't have the budget to allow the purchase of a PC or Argyll jacket anytime soon... but I do have an old suit jacket (two buttons) that I had tailored to my fit a couple years ago. The only issue I see with it going with the kilt is the stripes: the jacket is black and has charcoal pinstripes going up and down it.

Would this look funky with a kilt? Would it it appropriate? It's going to be an early morning ceremony, so I'm pretty sure it wouldn't necessarily call for truly formal wear, but I am looking to the rabble for advice on this occasion.