I used NewLook pattern 6123. As the fabric was a gorgeous double knit I didn't use a zip. In saying that it is not the easiest dress to get on as the waist seam doesn't have a lot of stretch and is relatively small. But it is worth the struggle to get into it to not have to have a zip.
My first mock up of the pattern was in a slight stretch cotton. This was disastrous. There was nothing right about the fit. I honestly don't know what happened. I was almost going to throw the pattern out when I gave it another go in a jersey knit. It was perfect. I still am not sure if I had done something drastically wrong the first attempt or it was simply the fabric. The pattern is not designed for stretch fabrics.
I fixed the neck facing in place with small amount of vliesofix as I didn't want it rolling out and the fabric showed up any stitching lines too much. I also did this for the hem line while also tacking it in place my hand in a few spots.