To set the invisible zipper, you need a special zipper foot which is sold separately. I put the zipper in the side seam insead of the center back seam as the pattern instructed. I wanted to eliminate the center back seam to avoid a seam in the very large pattern of the printed fabric that I had selected for my dress. Also, this way the zipper is really hidden under the arm.
The end of the dart must be sewn carefully and tapered gradually at the bust point. Do not back stitch the end of the dart. Instead leave long thread tails at the end and tie a knot by hand to ensure the dart will be smooth at the end.
This pattern does not have the grainline marked on the armhole facing pattern. The grain of the facing should be the same grainline of the main pattern piece. I aligned the armhole pattern piece with the front body pattern to mark the grainline of the armhole facing before cutting it out.