Stab Stitch is a very small tack used to hold fabric layers together without lines of stitching. It is most commonly used to hold together the layers of a Roman Blind when the customer does not wish to see stitching on the face of the blind.
Working from the back of the blind, the needle is inserted into the lining just under the pocket for the rod on all the rods except the bottom one. Here they are worked above the rod. It is inserted at a 45 degree angle, just catches a couple of threads at the front and then the needle is worked back up to the lining again. It is helpful to pull back the work to establish how much of the tack will show on the front.
The stitch is then worked five or six times over the first to create a strong stitch. Finish by working a final tie off stitch through the bottom of the tack then work the ends between the lining and the fabric.
The stitch can barely be noticed on the show cloth. To support the weight of the blind, a stab stitch should be made at each end of every pocket and one under every ring. Placing them under the pocket channels and then above on the bottom rod allows the blind to be seen from outside without any stitch marks when it is partially pulled up. For wide blinds you may need to stab stitch between the rings as well. It is suggested that stitches are no more than 30cm apart.