I've been reading earlier posts on this general subject, but I still don't feel that I have a good answer. So here it goes again. I've been looking for a lighter-weight high-end (preferably Oxxford) navy blazer on eBay for a long time with no success. But there's now a very nice new Oxxford orphan navy suit jacket out there. If my tailor changes the buttons out, can it serve as a blazer, or are suit jackets cut differently? I read all about pocket differences, but I'm not convinced that that's an issue.