Okay, so the last thing we did was to put the bra together.
Pin the lace in place and stitch along the lower edge. Use a "square zigzag" (about 2.5 long by 2.5 wide) and follow the scallops with your stitching. The easiest way to do this is to hold the fabric taut from in front of and behind the presser foot, and steer the fabric as you go.
Using a small pair of scissors, cut away the fabric from behind the lace.
It looks like this on the inside:
Lay the slip back out with the right side facing up. Place the elastic at the top of the piece, with the scallops facing down (the wrong side of the elastic is facing up). Pin in place at either end of the back piece. The elastic will be smaller than the back piece.
Next, flip the elastic to the wrong side of the slip back. From the inside, stitch again, positioning your presser foot so that the center of the foot is along the bottom edge of the elastic.
One side of the zigzag will fall to the left of the elastic, and the other to the right of it. Stretch as you sew.
Now it's time to sew the side seams! With right sides together, pin the slip front to the slip back.
Now your front is sewn to your back!
Previous sew-along posts:
Slip Sew-Along #1: Inside the Kit, Plus Other Supplies
Slip Sew-Along #2: Pre-treating Your Fabric
Slip Sew-Along #3: Picking a Size and Making Adjustments
Slip Sew-Along #4: Bust Adjustments
Slip Sew-Along #5: Cutting and Marking
Slip Sew-Along #6: Sewing the Bra Top