Circa 1930-31
In the 1930s, O’Keeffe often tucked her braided hair under a close-fitting, knitted cap, extending the silhouette of her clothed body to the top of her head. This allowed Stieglitz to picture her neck and head as emerging from the deep V of her neckline, like the streamlined form of a sculpture by Constantin Brancusi. This photograph also captured two little details typical of her style; a tiny bow on an undergarment at the bottom of the V, and a row of pearl buttons at her wrist.
(https://designlifenetwork.com/georgia-okeeffe-living-modern-virtual-tour/)