hmmm, i usually do 2 1/2 inch binding , especially if i do it all by machine. I sew it, flip over and put straight pins in going along the seam line catching the binding on the back but pinning on the front. that makes sure the machine will stitch right where i have the pins, which i remove as i go along. i take a bit of care pinning the mitered corners and usually catch those well too. if not, i go back with needle and thread.