This vintage real photo postcard features a pretty young teenage woman posing for her portrait. The teenager is beautifully dressed. She is wearing a checkered blouse with a collar pin. There is black fabric under the pin. Is she in mourning? The color of her blouse blends in perfectly with the color of the background of the photograph. This card has a Cyko stamp box indicating that the postcard was made by a private studio sometime between 1904 and 1920. SOLD
THE CABINET CARD GALLERY 
That checkered fabric is known as a hounds tooth.
Thanks for sharing the information about the fabric. I often have a hard time identifying the fabrics worn by the subjects in the photographs. Any comments about fashion seen in these images, is always appreciated.