It is knit top down from the underarms to the bottom in one piece with crocheted yoke which was added later. It also has a crochet trim along the bottom hemline about 1 1/2” to prevent the fabric from rolling up. Pearl Brioche Stitch works very well with this yarn, making a thick fabric with lovely texture. This stitch was used for the skirt part.
More info on this project at Ravelry: