 All the costumes in the film were designed by Mona May , who had previously worked on Clueless , The Wedding Singer and The Haunted Mansion . To create the costumes , May spent one year in pre @-@ production working with animators and her costume department of 20 people , while she contracted with five outside costume shops in Los Angeles and New York City . She became involved in the project during the time when the animators are designing the faces and bodies of the characters as they had to " translate the costumes from two @-@ dimensional drawings to live @-@ action human proportion " . Her goal was to keep the designs " Disneyesque to the core but bring a little bit of fashion in there and humor and make it something new " . However , May admitted this was difficult " because they 're dealing with iconic Disney characters who have been in the psyche of the viewing audience for so long " . 
