I made this costume before out of three different patterns and in three separate pieces. It looked terrible. Then I made it a second time, attaching the skirt to the vest to make an actual jumper. Since I didn't know how to make buttonholes, I put a zipper in the back. Not accurate, but it looked pretty good. Then, when I got a new sewing machine, I re-made it a third time. That version opens in the front with buttons and has a longer skirt for modesty. The photos below are of version two.

The fabric was some kind of gabardine that was a nice color and mercifully on sale. The patterns were a hodge-podge: A vest (Vogue # 9633), a pleated skirt (McCall's # 9490), and a jacket (Butterick # 6991). I made the jacket according to pattern directions. I was feeling spunky and even lined it partially. Then I worked on the vest according to directions, pinned the front closed and attached the skirt. Add on some buttons aaaaand...

Low and behold it worked! ^_^ The blouse, socks and Mary Janes I bought long, long ago, and I just glued a gold button on a purchased bow tie. The hair is all my own, believe it or not.