Marchesa Olga di Grésy (1900–1994) was an Italian fashion designer specialising in knitwear, active between 1928 and 1984.

[3][2] In 1926, Orazio lost the di Grésy fortune on the stock market, which meant that Olga had to work for a living.

[2][4] During the post-war boom in popularity of Italian knitwear among American buyers, Mirsa was one of the most desirable and widely recognised names.

[8] In 1970, garments produced by Mirsa and bearing Olga di Grésy's name were sold through I. Magnin, Abercrombie & Fitch, and other department stores.

[2] di Grésy garments were versatile, intended to be wearable at any point in the day or evening with slight styling changes, and also to appeal to all ages.