joining curved edges, plan seam will give a better finish than French seam and other type of . lines of stitching and is referred to as slot seam zipper placket. When you stitch the zipper in place, do not stitch around the zipper tab. Depending on the placket length and garment fabric, you may ease as little as Vs " SLOT ZIPPERS OR CENTERED APPLICATIONS The slot zipper is centered in the. (4) Cording foot or zipper foot(fig.5d): This is designed for stitching close to a raised placket. Zipper placket. Slot seam. Lapped seam. Invisible zippers. Fly.