If desired, sew the three panels together along the side seams. This will help keep them in place and in orientation with each other when they're inside the jacket.
Use a thread ripper to open the lower edge and pull the lining away from the fabric. Place the panels inside and pin them in place right where you want them. If you have connectors that go over the shoulder seams, connect them up.
Test to be sure the whole thing is working, and once you're happy with the placement, hand-sew the panels to the outer fabric layer. I used about 8-10 thread tacks on each panel to hold it securely and to minimize any seam lines showing on the outside of the vest. I also used my sewing machine to sew along the side seams, going through the fabric and interfacing but leaving the lining separate.
Cut a hole in the back of the pocket and slide your switch and Feather through, so they're both reachable from inside the jacket pocket. It's a great idea to sew them in place - this will minimize the wires getting knocked loose and will make it easier to find the switch with your fingers.
Machine or hand-sew the lining back in place along the bottom edge. Plug in your battery and slip it into your pocket. You're good to glow!
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