- Main color: Sky Blue
The fashion line started in 1994, when Castiglioni became known for her contributions to the design of fur, stemming from her husband's family fur business. At the time, fur was typically designed in an old-fashioned manner, but Castiglioni instead treated it as a normal fabric to make modern, wearable clothing. Her fashion line, named after her sister Marni, grew as her customers needed something to wear under or with their fur.
Today, the company produces ready-to-wear clothing, handbags, jewelry, and eyewear. Jenna Lyons, senior vice president of women's design for J.Crew, attributes Marni's success to the "post-Tom Ford era," saying that women are lately being bold through color, print, and shape rather than through overt sex appeal and are dressing more for other women than for men. Marni launched its first menswear line in Fall 2007, introducing leggings as standalone bottoms for men.
In November 2011, H&M announced a collaboration plan with Marni, to be launched in spring 2012. In 2013, the brand launched its first fragrance, Marni.
By the end of 2012 the majority in Marni was acquired by Renzo Rosso, President of OTB Group, the holding group of Maison Martin Margiela, Viktor & Rolf, Diesel and Staff International.