Cream the butter and add the sugar. Blend thoroughly. Sift the flour again and add the nutmeats. Combine the butter and flour mixtures. Add vanilla. Chill several hours or overnight. Preheat oven to 350ºF. Pinch off a small piece of dough at a time and shape into a crescent or "horn". Place on ungreased cookie sheet and bake for about 10 minutes. Sprinkle with confectioners' sugar while still warm. Store in an air tight container. Makes 3 dozen. These cookies improve with age and make good gifts. They also ship well.