LADDER STITCH
 
The Ladder Stitch makes a vertical zig-zag across only 4 pleats.

Start at the left side of pleat #1, and make a normal Cable Stitch into pleat #2 (Step 1). Next, make a normal Trellis Stitch, travelling down to the next row, into pleat #3 (Step 2). Next, make an Outline Stitch into pleat #4 (Step 3). Now it gets tricky. Travel down to the next row, and insert the needle into the right side of pleat #1, exiting out the left side (Step 4). Stitch a normal Outline Stitch into pleat #2 (Step 5).
 
 
The Ladder Stitch is often paired with a mirror image, stitched between pleats #3 and #6, to make a delicate diamond vertical border.