After her husband's insistence that she revisit "The Great Gatsby", which she had not read since adolescence, the two began working on the novel's cinematic reinvention. The conceptualization for the film began 10 years prior to its release. Three years before it made its debut, Martin and Luhrmann began the initial design project for the film. The two consulted academic texts about the novel, as well as historical analyses pertaining to both Fitzgerald himself, as well as his work. They visited libraries at the Metropolitan Museum of Art and the Fashion Institute of Technology to further their research. Martin described herself during this time as being "like a detective". Luhrmann stated that since the book took place in 1922, was published in 1925, but foreshadowed the economic crash of 1929, anything within that decade was available to borrow for design purposes. This allowed Martin more room to play with trends and flattering pieces, such as her choice to dress lead actor Leonardo DiCaprio in slimmer-cut suits than what would have been typical in the beginning of the decade. For the women's clothes in the film, she erred towards the end of the decade, wanting to focus on slimmer silhouettes. She also took artistic liberties when it came to the actresses' shoes, telling Vogue that she found heels from the era to be "stumpy". She rationalized her choice to her usually anachronistically aware-self to use thinner-heeled shoes by telling herself she was copying what was found in fashion illustrations from the time. Martin was charged with creating 500 outfits for the film's various cast members. Martin worked with Brooks Brothers and Miuccia Prada, a longtime friend of her husband's, to design the costumes for the film. Prada designed twenty of the dresses for the film's first party scene, and an additional twenty for a second party scene. Tiffany & Co. supplied the film's jewelry.