2 matching fat quarters
matching bias tape
Step 1: On both of your fat quarters measure and mark with a fabric pen at the following measurements from the top: 1/2", 3", 5 1/2", 8".
You're now going to sew down each of these pleats that you made from the top down to the 8" line.
Cut out your dress shape from both fat quarters.
Here are some pictures of how I finished the bias tape around the arm hole. Get about 1-2" away from the end, stop and lift your sewing machine foot with the needle down.
Clip the bottom corners of your remaining bias tape.
Fold them under,
sew across, and then finish the seam by going up the edge as well.