The MIDI-trigger’d pants would not be completely free of the computer, and therefore would not a truly “wearable” device. The scope of the project has now been changed, still keeping the orginal scope of a music-enabled device that you wear.
I have taken apart a toy-keyboard, and I will use that to produce sound. I want to rig a trigger using a zipper, certain notches on the zipper hit a note. in theory the zipper would go up the scale of the keyboard – two octaves.