She opened her boutique on Milan's Via Montenapoleone in 1966, debuting at the Pitti Palace in Florence — a collection entirely in shades of violet that prompted The New York Times to call her "the shrinking violet of Italian haute couture." Her clothes were geometric, often described as fashion-world cubism, with signature beading and "double facing" wool coats; her designs borrowed from the modern art she collected, by Vasarely, Calder and Fontana.
Her men's line and first women's prêt-à-porter arrived in 1971, and by the 1980s she had shops in Italy, Japan and the US. Clients included Jacqueline Kennedy, Lee Radziwill and Marella Agnelli. The brand passed to Itochu in 1993, then to Brand Extension in 2007; her work is held by the Met and the V&A.