When ordinary Americans began buying cars in large numbers, car camping became a popular pastime. The first club devoted to this leisure time activity was formed in 1919. As we can see above, it was not just for the young.
I tried to date the photo by the car, which has a square back and rectangular window similar to a Ford Model A. Maybe you can do a better job? If I’m correct, then the earliest date for this picture would be 1927, when the model was first introduced. That time frame would also match the woman’s knickers. These short trousers became popular sportswear for women in the 1920s and were worn by young and old alike.
Was this woman off for a long trip or a short picnic? There are certainly a lot of items on the table. The trunk on the left makes me think that she had a longer trip in mind.
Too bad the photographer cut off her shoes!