I have this cheap ass thin sweater from Banana Republic. It is 65% cotton, 30% silk and 5% cashmere. It looks great on me, fits me to a T. I usually wear it with the sleeves rolled up a bit. After a wearing or two, the sweater stretches out, especially the sleeves. Any idea how to shrink it back to where it was? Dryer on hot for 15 min? Wash then dry? Or should I just take it to the cleaners & pray?