Before you plunge ahead w/ this fabric for a OBW, I'd preview what your hex's might look like by using a hinged mirror. Position it open so you can see 6 images in it and slowly slide it along the width of the fabric. This will give you an idea of what your hexagons might look like. If there's too many places with those straight lines, you might want to pick a different fabric for a OBW. See what K3N said.