The salesperson at J. Crew gave me a tip yesterday. She said I should put my new cashmere sweater in a ziplock bag, and then put the bag in the freezer for a day. She said I could wear the sweater the next day, and it should not pill. Sounds crazy, but I'm so fed up with my cashmere sweaters pilling after a wear or two, that I'm thinking about trying it. Before I get freezer-happy, tell me... how do you keep your sweaters from pilling?