Aligator clips are valuable prototyping tool when temporarily connecting circuits. They clamp on to conductive threads and fabrics just as effectively as microprocessors and battery holders. You can find them online or at your local hardware store.
They like to knot up on your workbench.
Or you can attempt to keep them organized.
They come in different sizes for the clip as well as length of connecting wire. For eTextiles and paper computing prototypes you will want something small.
Here I am testing a breadboard for short circuits.
