I am planning a trip to Vietnam, so a friend showed me a dress she got made there. Of course, I had to turn it inside out and check out all the construction details...and to my delight, saw something new. The front princess seam was constructed by folding out a curved dart in a single piece of fabric, rather than cutting a side front and centre front and stitching the two together.
Other quick construction features include binding the armholes and neckline with a binding that sits outside the dress. These were completed before the side seams were sewn, which I guess allows for quick alterations.
Similarly for the zipper insertion, the neckline was bound, then the zipper attached and the top of the zipper tape folded away between the dress and the turned back edge.