So now that we know about overall/edge-to-edge quilting, (you can read my first post on that here) what exactly is custom quilting? Custom is any type of design that does NOT completely cover the quilt top with one pattern. There are actually different levels of custom quilting. I sometimes break them down into simple custom, basic custom, full custom, and heirloom. (Other quilters may have different terminology.)
SID is short for Stitch-in-the-Ditch. The “ditch”, in quilting terminology, is the seam line between two patches on the right side of your quilt top. When quilting the top, stitching in the ditch will make your patches stand out and give crisp and clean lines to the finished quilt.
When SIDing, the object is to have your quilting be as invisible as possible. Since seam allowances are generally pressed to one side, you sew on the ‘low’ side (the one the seam allowance is NOT lying under), as close to the seam line as you can. When the fabric relaxes after the quilting process, those stitches will lie somewhat underneath the ‘high’ fabric and hardly been seen.