Huge selection of Book Character Dress-Up Day costumes for Adults and Kids. Olivia the Pig: Dress up as the adorable pig character of Ian Falconer’s children’s book Olivia the Pig.To transform into the pig you would need a red dress, charcoal striped t-shirts and leggings, black and red flats and piggy ears. https://www.pinterest.com/marcitate/book-character-dress-up-day These book character costumes, inspired by classic picture books and YA novels, are perfect whether you're dressing up for Book Week or trick-or-treating for Halloween. Buy your Book Character Dress-Up Day costumes from the costume authority at Halloween Express today! Easy To Make Book Character Costumes for Adults. From Curious George costumes to Alice in Wonderland costumes to Peter Pan costumes, we're sure that you'll find it here.