Originally Posted by
Scissor Queen
What it makes is actually called double fold binding. Single fold is when just one edge is folded to the center. Binding that's just folded in half is actually called French fold binding.
Most people consider Single fold to be both raw edges turned, with Double fold to be both raw edges turned and then the entire piece folded together.
"Bias tape comes in
Single Fold or
Double fold.
* Single fold is flat, with single edges folded over. It’s often used as a trim and sewn flat just as it is, such as parallel to a hem or with decorative stitching on the top.
* Double fold bias tape is single fold tape that has been folded again in the middle to create a sandwich. Note that the fold is actually slightly off-center, so that one side is wider than the other, by a fraction. This makes it easier to sew with and decreases the chance of sewing on the top of the binding and somehow missing the back of the binding with your stitching. That may sound confusing. Try it out and it will all make sense."
source -
http://www.danamadeit.com/2008/07/te...bias-tape.html