You could cut pieces 4" wide, press in half, then open it up and press the raw edges towards the middle. That would give you 1" finished straps. If you wanted them padded, you could use batting or fusible fleece cut about 1/4" smaller than the fabric. Center the fleece on the fabric and continue as above. I usually stitch about 1/4" away from the edges using a walking foot (it helps a lot).