What is the best way to block an already sewn together cardigan that is too small across the front? The back piece and the sleeves fit perfectly, but the two front pieces are too narrow for my MIL's body. The pattern is a purchased pattern from a reputable source. Since this sweater was her Christmas gift, I need to get the sweater blocked as quickly as possible. The yarn is 50/50 washable wool and acrylic. Thank you!