Lanvin made such beautiful clothes for her daughter Marie-Blanche de Polignac that they began to attract the attention of a number of wealthy people who requested copies for their own children. Soon, Lanvin was making dresses for their mothers, and some of the most famous names in Europe were included in the clientele of her new boutique on the rue du Faubourg Saint-Honoré, Paris. In 1909, Lanvin joined the Syndicat de la Couture, which marked her formal status as a couturière.
From 1923, the Lanvin empire included a dye factory in Nanterre. In the 1920s, Lanvin opened shops devoted to home decor, menswear, furs and lingerie, but her most significant expansion was the creation of Lanvin Parfums SA in 1924 and the introduction of “My Sin” in 1925 widely considered a unique fragrance, an animalic-aldehyde based on heliotrope, which would be followed by her signature fragrance Arpège in 1927, inspired by the sound of her daughter’s practicing her scales on the piano.
One of the most influential designers of the 1920s and 1930s, Jeanne Lanvin’s skillful use of intricate trimmings, virtuoso embroideries and beaded decorations in clear, light, floral colors became a Lanvin trademark.