My jacket is almost done, tried it on this morning and it looks fantastic :thumbsup I would post pics but the tailor forgot something minor so I need to wait another day, will definitely have pics up over the weekend. My biggest recommendation for those making alterations is to sew on darts in the armpit area, this is what my tailor did to open up the shoulders and lats. He did add 1/2" of fabric to the top shoulder seam based on my request but I don't think that did very much to the overall look.
One thing to note is that even with the added fabric, the entire jacket will still move up when raising the arms, which was a common complaint for the Cosplaysky Cap suits. Unfortunately there's no way around this. I believe the SU suit is built with the torso as a vest and the sleeves as a separate piece connected to an undershirt, see the Civil War set photo below to see what I mean. So unless you want to completely overhaul the Cosplaysky jacket, we'll just have to live with this design flaw. The good news is that with the added fabric, it allows for a little more movement before the entire jacket moves, but is still limits the poses you can achieve for photos.
Stay tuned!
http://i.dailymail.co.uk/i/pix/2015/05/15/20/28B88D5B00000578-3083716-image-a-65_1431718128672.jpg