Here in Georgia, September is definitely not the start of Fall weather! My dress for September for Alice and Camilla's Dress Challenge is simple and 60's, and still very summery-looking. My Mom had a dress very much like this. The reason I remember it so well is that she wore it during a vacation trip to Chicago and it appears in many photographs. She made it herself, as she did all of her clothes, and mine as well.
I painted the paper with dabs of watercolor and after it dried, wadded it up in a ball. I then unfolded it carefully and glued it to the dress form, using a brayer to add the crinkly details. I then used a thin marker to highlight the flower shapes. The boat neck was a very popular style in the 60's.