From the pink gingham pants and pastel-yellow overalls of a sacrificial lamb, to the sexy Versace revenge dresses, power suits, and bicycle shorts of a free woman, British fashion journalist Eloise Moran has studied thousands of pictures of Princess Diana. She soon discovered that behind each outfit lay a carefully crafted strategy: What Lady Di couldn’t express verbally, she expressed through her clothes.

Diana’s most show-stopping―and poignant―outfits are all here in The Lady Di Look Book, incisively decoded. Moran sees things no one has before: Why, for example, did Diana have a rotating collection of message sweatshirts? Was she mad for plaid, or did the tartan have a deeper meaning? What about her love of costume jewelry on top of the tiaras and oval sapphire engagement ring? With new interviews from some of the people who dressed Diana, Moran’s book is both a record of what Diana wore and why she wore it―and why we are still obsessed with Lady Di.

From 1980s Sloane Ranger cottagecore Diana, to athleisure and Dynasty Di Diana, The Lady Di Look Book is both compulsively delightful and a full biography of the world’s most beloved royal.