From this site....
http://www.quiltedparadise.com/n/083-uid.jsp ...
"French fold binding is cut wider -- usually 2" to 2 1/2" is standard. Then fold the pieced strips in half lengthwise with wrong sides together and press. Then it is stitched to the quilt -- matching raw edges of binding with the raw edge of the quilt. Use a quarter inch seam. After stitching, turn binding to the back of the quilt and hand stitch. The folded edge is already finished and ready to stitch to the back of the quilt with no additional turning.
Using French fold binding -- either straight or bias -- will assure that even if the edge of the binding is wearing the inner parts of the quilt won't show because there is a second layer of binding behind the top layer. You won't have to replace French fold binding as often as the edge of the batting won't show."
I usually use 2-1/4 in. strips; fold/iron in half lengthwise; and sew as the ol' waistband method in Jr. High. Home Ec. LOL a looooooonnnnnggggggg time ago! LOL