The polka dot dress!
I think of this as the archetypal dress of the 1930s, when polka dots were everywhere. This particular outfit has some fancy details. The dress itself appears to have a halter strap around the neck—or is it trim over netting? On top she wears a short jacket with puffy sleeves made from sheer fabric. This is clearly a dress up outfit for some special occasion, underscored by the big bouquet on her chest. She wears a hat at a jaunty angle, adding to the dark and light theme.
Written on the back is “Mother at the Old Farm,” with a printer’s mark from Minneapolis, Minnesota. What does “Old Farm” mean exactly? Had the family acquired new property, or had they moved to the city and left country life behind?