I popped in the Zimmermann store recently and loved the palette I ended up with in the dressing room. I didn’t have fall in mind, but realized how well these would work when I’m in a fall-ish mood and it’s 80 plus degrees. With that in mind, I rounded up other dresses that fit the bill.
The left two are contenders, see below, but the ecru was too short for my taste. 
Zimmermann Ottie Dress (and here)
Zimermann Broderie Anglaise Dress
