It seems I miss read your post. I thought you were having a regular three-piece suit made, but with Highland cuffs, pocket flaps, etc. Giving it a second reading it seems as though you want a tweed kilt jacket and waistcoat with matching tweed trousers. That being the case, the easiest way to overcome the problem of getting the jacket right would be to do what I did: search ebay for the Simplicity Pattern for a Scottish day wear jacket, buy it, and give it to your tailor.