I've been following this thread, and I have found it to be very helpful. I constructed this costume for my 14-year old daughter. I'm a 501st/Rebel Legion member, and she enjoys trooping with me. As we all know, there has been very little reference material available for this costume. When I started this project a couple months ago, I was making the assumption that Jyn's Imperial disguise was a TIE pilot costume. So, I went out and purchased a low-end set of TIE pilot chest/back armor, with the hopes of modifying it. Since then, we have learned that this disguise is actually an Imperial ground crew member. I've gone ahead and assembled what I'm calling version 1.0 of my daughter's costume. The chest and back armor is far from being screen accurate, but I think it captures the overall look. She wore it at the Cincinnati Comic Expo last weekend, and we received a lot of positive feedback. I consider myself a novice costume maker. Prior to reading this thread, I would not have considered attempting to construct the armor from scratch. However, I've been really inspired by what catmew has accomplished with EVA foam. Time to start watching the YouTube tutorials.
There is still a lot of details that we do not know about this costume, so I think I'm going to hold off, before attempting a custom build for the armor. I'm hoping we will see more of it in the coming trailers. Or, I suppose I can wait until after the movie release. One thing that I will note, I do not want to be influenced too strongly by the 3.5 inch action figure. For example, from the four screen shots from the movie (posted above), it appears that the back piece that holds the light batons has an open configuration, as opposed to deep channels for the batons to fit into. I personally think that the deep channels were purposely added for the action figure, so that the batons can snap into place. I constructed the baton holder back piece from Sintra PVC board. I used a heat gun to curve the edges of the "V," It's anyone's guess, if this is accurate, but it is my interpretation of what I see in the screen shots. I used industrial Velcro to the hold the batons in place. Anyway, here are photos from our convention...
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