Decorate a plain shirt over the shoulder/chest. Cut off the sleeves.
Cut a strip from another tee, about 1" wide and as long as the edge of your neckline. Fold it in half lengthwise.
Sew it on to your neckline with right sides facing.
Cut another strip, about 2" wide and sew up the front, pleating as you go.
Cut up the middle of the leftover fabric to make ties.
Sew on the waistband from another shirt. Pinch it together under the ruffle and sew on a tab.