Carnegie was considered one of the most influential contributors to American fashion for over five decades. Her French-inspired designs became the toast of the high fashion world during the thirties and forties. Though she initially catered to a very wealthy clientele, she expanded her fashion lines and garnered a much wider following with her ready to wear dress and suit designs. Carnegie’s fashions influenced a generation of American women and inspired countless designers. Her signature Carnegie suit and simple “little black dress” were considered fashion essentials for American women.