Definitely size down
This dress is beautiful--lovely colors and design--but it's huuuge. i'm usually a s/m in tops and dresses, but i got an xs after trying it on in the store. i'm busty and have hips and still have a bit of room. the length is good--a little above the knee but still work appropriate. with my curves it's not my most flattering dress since it pretty much falls straight down, but i think it's too pretty not to keep.