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I was wondering the same thing but after reading this article I think I know how the author did it. Poke/cut a hole and run the EL wire inside the costume to have a "disconnected look" from the wire to separate the bones, if the light show thru from the inside, I would wrap it with something maybe tape but that might leave a sticky residue. I hope this answer your question. I'm glad I found this instrucable because I have 9ft wire and I want to do stick person costume for my son but I haven't worked on the costume yet because I'm trying to figure out how to 'separate' the wire where I don't want to see the EL wire lights up. Thanks author!
It's not loud but noticeable, at first I thought mine was defect I'm glad the author mentioned it now I know it's normal