Step 7: Finishing steps
After all the wires running back to the inverter and battery pocket are stabilized, reconnect them as needed. They can be hard-wired to the driver, or joined to a plug if you want it to be easy to change it later. Use heat-shrink tubing or other insulators to ensure that you do not short out the two conductors to each other.
Advice for the battery pocket:
Use an existing pocket in the garment or add one, if necessary. The pocket should be close to the size of the battery pack. If you will be dancing or moving a lot in the coat, you don't want the battery pack to bounce around too much, or fall out. Closing the pocket with a zipper or velcro can be helpful.
Clip a small part of the pocket seam, pass the wire through, and re-sew the seam closed so that the parts don't fall back into the lining. If you do not plan to change the inverter, that part can be hidden in an inaccessible part inside the lining, or sewn into a separate closed section of a pocket. Run the wire for the battery connector to that pocket. There should be enough excess wire to easily access the end and change batteries.
Many EL drivers run on 9V or 12V. A standard 9V battery is good for many applications. If you want longer battery life with a 9V system, you can also use a 6-pack of AA cells.