When buying a jacket off the rack, what are the most important points of fit, or measurements if you're buying on line? I would think length obviously one of the first, especially for a short guy like myself. After that, is shoulder width or chest and back the more important measurement? Which is easier to deal with in alterations? For me, I find a lot of jackets that have the proper chest and back have shoulders that are too wide for my taste. Am I making a mistake looking for proper shoulder width over chest and back fit?