You can choose between 3 necklines for your abaya in sha Allah. One with a 25 cm long zipper, which is also suitable for nursing mothers, one without zipper and the third – full zipper. Full zipper will be closed with the zipper down to approx 10-20 which will be open.  Please see the illustrations below to see how the 2  first necklines look (press on the images for a clearer picture):