When Eugene Speicher, an older student at the Art Students League, asked O’Keeffe to model for him, she wore a three-piece outfit associated with the so-called New Woman: a white shirtwaist, black skirt and jacket, and black bow at her neck. This combination allowed women to move with greater ease than in conventional Victorian dresses and was a style of reform dress widely endorsed by budding women artists and professional. In 1948, Life magazine ran an image of the 61-year-old O’Keeffe posed next to the portrait (in a different frame), noting, “she has changed from an unknown youngster to one of the foremost painters in the US.” Her personal style, however, has remained the same.
(https://designlifenetwork.com/georgia-okeeffe-living-modern-virtual-tour/)