Binding is a quilter's personal choice. I like bias bindings and cut mine at 2.5 wide for cottons and 3.0 for flannels or fleece. My friend would say a straight edge binding is just fine and cut hers 2.0 inches for cotton and 2.5 for flannel. There is no "right" for binding. It's your quilt so bind it your way. My MIL who is now 88 years old has always used the back (cut 1.5 inches wider than the front) folded it over to the front and top stitched it down. Those quilts have lasted for years through frequent washings. She figures by the time the binding is worn out, the rest of the quilt will be too. This logic works for me.