Stitch Effect

Here is a shot of the Appearance panel of the stitch effect. Basically it consists of three strokes of varying point sizes. Each stroke has a Zig Zag Effect applied to it. In the Zig Zag Effect, the Size is 1px and the Ridges is 100. Then the top stroke's Vertical Move from the Transform effect is 1px. The bottom stroke's Vertical Move from the Transform effect is -1px. Hope that helps!