Because of Reasons, I didn't get a picture of the finished pack until much later when the squirrels returned, and it is Low Quality, but you can get the sense of it at least.
"Submitted by Ace Monster Toys for the Instructables Sponsorship Program"
Step 1: Tools & Materials
- one felt battery cover (URL)
- small amount of velcro
- conductive thread
- two LEDs (I used through-hole but SMDs would work if you solder a bead to the leads, to sew through (URL))
- a pair of magnetic purse closure snaps
- EL wire (not shown in the pic)
- hand needle
- round nose pliers (the kind where each prong is round)
- needle nose pliers (the kind where both prongs together, when closed, are round)
- hot glue gun
- sewing machine