Hi Ann-Hartley, Thanks for the compliment! I used an invisible zipper. The pattern calls for a zipper in the left side seam, which opens at the bottom - kind of unusual but it gives a nice fit. I substituted an invisible zipper since I don't like the results from my sewing machine's regular zipper foot. The hardest thing about invisible zippers is the crazy geometry -I have to pin EVERYTHING and flip it right side out to make sure I haven't put something in backwards or upside down. But apart from that, invisible zippers are pretty easy to install and they look quite elegant.