I agree with the above advice, with one small difference. After unpicking, I would hold a steaming iron about an inch above the fabric for about 10-20 seconds, then wait for it to cool, then do it again. This will help the fabric relax back into it's natural, un-stretched state. Then spray starch and press, not iron. Meaning, do not swipe the iron across the fabric. Move the iron only by picking it directly straight up off the fabric, then move it to a different spot and set it back down.