How does it work?
In order to make the bracelet work, the negative hole on the light has to be connected to to the negative hole on the lilypad and the positive hole has to be connected to the positive side of the light. If your threads over lap or touch in any way it will make a problem called a short circuit. This makes the current stop and not work functionally.
No, I did not make any modifications. I was pretty firmilar to these circuits from freshman year engineering class because of that I didn't have modifications because I had experience.
Tips to help
Make a drawing of your circuit design before
Make sure no conductive threads are touching or overlapping!