In cashmere, as with all of life's luxuries, the starting point is top-notch raw ingredients and, critically, knowing how to treat them when you get them home. Did you know, for instance, that you shouldn't dry-clean your cashmere but (gasp!) wash it in the washing machine, or by hand? This fall, Dijkstra's brand is opening a store in New York's SoHo, complete with the right machines to get the stuff clean.