I made it at Techshop. http://www.techshop.ws/
I needed a cell phone case for my new phone. I wanted something that stretched to phone shape and easily fits into my pocket. I came up with the following.
Step 1: Materials for case
I purchased a stretchable knee support form a dollar store. Pulled out needle, scissors, needle threader and some matching thread. This actually yields two cases.
Step 3: Cut the leg brace
I cut the brace with household scissors about 1 inch past the side of the phone. (I did not measure).
Step 4: Sew the cut end.
I do not know the name of the sewing stitch I used. I started about a ¼ inch from cut off end. I pull my stitches tight, going over the cut end; spacing my stitching about ¼ apart. Going from one side to the other and back again; I then knot it off and cut.