I am 5'9" and usually wear a L or size 10 in anything. I am a Large in this dress and own the short-sleeve version in 4 colors, and another sleeveless in black.
We live in St. Louis and just went to Florida for a week for spring break. I took 3 of these dresses and 2 lightweight jackets to wear over. They survived the airplane, walking the shops, and nights out with the family for dinner. I have two boys, aged 10 and 7, and I like to be practical but also try to look more dressed up than average. These dresses were fantastic. I hand washed them in the tub in the hotel (didn't trust the community laundry), hung them up to dry and they were good as new! Perfect dresses. I will buy one in every new color they come out in.
I am helping chaperone the 2nd grade to the zoo this week and I will be wearing this dress, green jean jacket, and black Jack Purcell shoes. PERFECT!
For anyone buying the Ashley dress, I sized up on that one and got XL.