The only thing I would careful about is the finding the right person for the job. It is more than just sewing a few decorative buttons onto the sleeve and calling it a kilt jacket. I have seen to many disastrous attempts at altering coats. I have seen people spend a lot of money having a coat altered and it turning out horrible when they could have spent less money and bought a true kilt jacket. A nice Crail Jacket or Braemar Jacket made from tweed has a very sharp look without being too formal (more sport coat like) and are very reasonably priced. But that’s just my opinion.