Following in the footsteps of artists such as James McNeill Whistler and Oscar Wilde, Stieglitz wore a full-length Loden cape with distinctive round buttons as his everyday “art dress.” In their early years together, O’Keeffe liked to dress up in his cape for their photo sessions. He enjoyed posing her in ways that made the form of the cape appear as a solid pedestal supporting her head.
(https://designlifenetwork.com/georgia-okeeffe-living-modern-virtual-tour/)