Andres Otalora Sus Miradas Green Dandelion Dress

I'm looking at the size chart and I'm generally a 10-12 - 5 foot 6.5. I'm finding sizing is inconsistent and sometime i go down a size. i'm thinking this style may allow for this? I am hoping to get to city this thursday or friday so could aim to come to ponsonby. are you available during the day by chance?