Lay bodice back, wrong side up on ironing board.
Starting at center back, press 3/8'' fold, working your way to sides of pattern piece.
Starting at center back again, fold second time 3/8'', first fold should help guide second fold.
Fold all the way to bodice sides. Do the same for bodice front.
At this point your shoulder seams will be already stitched together (raw edges finished with zig zag or serger):
with wrong side facing up, fold 3/8'' first, start at shoulder seam and work your way to side seams.
Fold second fold at 3/8''.
Fold to edge of pattern piece.
Do not stitch hems yet (side seams need to be sewn together first).