If you are just getting into sewing you may have seen the term “grainline” floating around and showing up on almost every pattern piece you work with. It is typically marked by a long straight line with an arrow on each end. The grainline indicates how you should position the pattern piece on the fabric. For pattern pieces cut on the fold the grainline is the “cut on fold” line with arrows indicating which edge is placed on the fold. If you are new to this term and aren’t sure why grainlines are important then read on, my friend.