There are numerous excellent discussions and expositions here on X Marks, regarding both nomenclature and escalating degrees of formality. I would urge anyone who hasn't done so to consult McMurdo and Panache's excellent thread One Kilt Ten Looks. A quick search on the Traditional Highland Dress forum reveals several informative and useful threads on various jackets. And, of course, many of us are just waiting to answer your questions. Some of us may even get the answer right.