The woman on the left is in an apron that makes me think she is puttering around the house. And yet she looks so stylish. She has great Gibson Girl hair and her shirtwaist is perfect! The other woman seems younger to me-perhaps it is the shorter hem line.
In my mind I have created a story. The older sister has headed off to the big city and has become very stylish while there. She comes home to visit and while home, she dons her old apron to help her sister around the house. Dad pulls out his new camera and asks his girls to head outside so he can capture the visit.