The Castles appeared in a newsreel called "Social and Theatrical Dancing" in 1914 and wrote a bestselling instructional book, "Modern Dancing", later the same year. The pair also starred in a feature film called "The Whirl of Life" (1915), which was well-received by critics and public alike. As the couple's celebrity increased in the mid-1910s, Irene Castle became a major fashion trendsetter, with her bobbed hair and shorter skirts. Her chic wardrobe was supplied almost exclusively by the couturière 'Lucile', (Lucy, Lady Duff-Gordon) but Irene also designed some of her clothes herself. 