I know that there are ways to tailor normal sports coats, suit coats, tweed coats, into kilt jackets. Is there really any way to convert any of these into more formal types of jackets, doublets or Prince Charlies? I really am more interested in the doublets (I know there are various kinds). I am on that student budget... If this isn't possible where could I find a pattern to make a doublet? (I have a friend in apparel design who I can put to work.)

Any help or advice would be appreciated.

-James Mungall