Skirt pattern piece (center fold is to the right). The top is a freehand curve - you can get away with impreciseness when working with knits.
Muslin after taking in the side seams. The skirt is short to save fabric.
Seam construction: narrow zig zag supported with a medium zig zag in the seam allowance (method recommended by Connie Long in "Sewing with Knits").
Elastic application 1: zig zag stitch to wrong side of fabric.
Elastic application 2: fold over edge of fabric, enclosing elastic.
Elastic application 3: topstitch with a narrow zig zag to finish the hem.
Bodice pattern: rectangles based on body measurements plus negative ease. The side seams are tapered at the waist; the top edge of the bodice is curved to fall under the arm at sides.