I am unsure- had ordered and sent back and now ordered again! I've bought the 8 and the 10. The 8 is a better fit around the hips but TBH there is very little difference in fit- about an inch or so around the bust. The 8 is tighter - obviously- but the 10 is slightly comfier- but then the hips are a bit looser.
I thought it was nice for very hot days and it doesn't crease like linen. I might wear it with a cardi or a denim jacket if cooler.
I am not sure about the high neckline as I prefer a scoop neck, but rarely see any everyday summer dresses that i like.
www.boden.co.uk/en-GB/Womens-Dresses/Above-Knee-Dresses/WH320/Womens-Chic-Jersey-Dress.html?NavGroupID=4
Frumpy or passable?