To make the 1/8" wide double fold bias tape, I cut the regular 1/4" wide double fold tape in half and then pressed that in half!! And used tiny tweezers to help guide it under the presser foot of the sewing machine. I thought they were hard.
But, the folks at Simplicity liked them so well, they were turned into a pattern, so you folks can go crazy making them, too.
If you get stuck or frustrated making these, just send me a message from the "contact" page, and I will try to help.