In Young lady in a hat, sitting with her arm around an older lady, we see a young woman dressed elegantly in a stylish hat. The older lady beside her appears warm and inviting, suggesting a close relationship. The colors are soft and muted, creating a gentle atmosphere.

The background is simple, allowing the figures to stand out as the focal point of the composition. The painting is executed in oil on canvas, typical of James Abbott McNeill Whistler's technique. The brushwork is delicate, with attention to the textures of the fabrics and the expressions of the figures. The use of light and shadow adds depth, enhancing the realism of the scene.

The dimensions are approximately 60 x 80 cm, making it a medium-sized portrait. James Abbott McNeill Whistler was an American artist known for his contributions to the Realism movement. This particular work reflects his interest in capturing intimate moments between individuals. An interesting fact about this painting is that it showcases Whistler's ability to blend portraiture with a sense of narrative, inviting viewers to ponder the relationship between the two women.

The work is housed in the Museum of Fine Arts Boston, where it continues to be appreciated by art lovers.