I just saw this on Oh Happy Day and realized how easy this would be to make. Which is interesting because it's a Built by Wendy design and I would use her own pattern, Simplicity 3835 to make the dress. Use pattern view C for the top, but lower the curve of the front and back necklines and add to the length and width of the sleeve pattern piece. Cut out and sew two large rectangles together for the skirt, add inseam pockets to the sides, and hem. Gather this portion to match the width of the bodice and attach the two together. Create a long rectangular sash and voila!