If you go a bit wider on the binding, you'll have to take a "bigger" chunk on the first seam when you sew it to the front of the quilt, like 3/8" or the front will be narrower than the back when you fold the binding to the back to sew it on. If you are thinking of ever having the quilt judged, the judges want the front and back to be the same and the fold of the binding to have the sandwich part filled to the crease.