I've done a conversion on a thrift store jacket, the new hem of the jacket was targeted to hit the bottom of the fell of my kilt, that was the easy part of the conversion, the tough bit was the sporran cutout curve and having it not end up right in a button hole. (A three button jacket was ideal for me), I made a paper cutout of the desired curve and flipped it over to do the other side of the sporran cutout. Often the pocket flaps look too low on a conversion, raising the flap to just barely cover the pocket slit looks ok quite often... Mine was a patch pocket jacket and I ultimately decided that for the time being no pockets at all lent a clean look that my wife approved of and so that was how it stayed.. I have a few pics as well as a thread on the conversion somewhere here on the forum...