No wardrobe can be without a little black dress. It’s a failsafe outfit that is the one thing you can pull out of the wardrobe when you have those ‘nothing to wear’ moments. I have a wardrobe of little black dresses which I know cover every occasion and never look anything less than chic. And celebrity fashionistas know the value of the LBD too. From Audrey Hepburn in Breakfast at Tiffanys, and Marilyn Monroe wearing Norman Norell, black dresses have always been a style staple for the Holywood greats. And stars like Angelina Jolie, Jennifer Aniston and Kate Moss show that the power of the little black dress is still…