Check out some waiters jackets some of them come with a vest and have short tails....
Try goodwill shops or the sally ann sometimes kilts and jackets turn up there.
but with all due respect...the PC jackets are made with fine 100% wool there is a reason why they cost $350-$500 and they are tailered to make you look good. Compared to a wedding dress for a bride the cost of a complete kilt ensemble is peanuts....
Archangel has a point check out the rentals they may have a few PC jackets with cigarette burns in them they are willing to let go for $99.95