Before anyone say yes some of this is my take on her since she doesn't have a name in canon

She’s wearing an elegant, off-shoulder dress with a deep blue bodice trimmed in red along the neckline with a small bow detail in the center. Her long gloves fade from dark blue to white, giving a gradient effect, and she accessorizes with a red gemstone necklace. In her hair, she has a red flower clip that stands out against her long, flowing dark hair. The outfit has a romantic, refined style that matches the soft, glamorous vibe of the scene.