Has anyone successfully shrunk sweaters without damaging them? My father is cleaning out his closet and gave some wonderful sweaters. 3 are larges,however, and I'm definitely a medium. One is a Polo RL, thick cotton yarn in a fisherman pattern. Another is a finer gauge of cashmere, and the tag of the third only identifies it as wool, in a yarn gauge and weight that approximates a typical lambswool v-neck sweater vest. Any suggestions?