The Ladies Who Lunch need to refresh their wardrobes with a new little black dress from time to time. While I was in Boston for the Flower Show I stepped into Macy's to get a new pair of little blue jeans.  I like the styling of these which have retained the integrity of the originals designed by Levi Strauss. Blue jeans are  a staple of the gardener's wardrobe, so easy to dress down, and versatile when combined with…