Step 1
Pin your unfused front & back bodice A pieces together at shoulder seams. Stitch together. Press seam allowances open. Repeat for your fused bodice A pieces.
Step 2
Place your fused and unfused bodice pieces together with right sides facing and pin together around neckline. Stitch. Trim seam allowances in half and clip around curves. Unerstitch seam allowance toward fused bodice. Turn through to the right side and press neckline well.
Step 4
Starting from one side seam of bodice, tightly roll bodice until you reach the armhole of the other side. Open up the two layers of armhole, and wrap around rolled portion of bodice sandwiched in half and clip around curves.
Carefully pull through to the right side and press armhole well.
Repeat on the other side.
Follow the rest of the steps for the skirt tiers, pockets and finishing on the Celestia dress B tutorial here.