i'm 5'6", 120 lbs and ordered the petunia/white in a size 2.  it fits perfectly, and i love the shape it gives me.  as it has a high neckline and hit rights above my knee, this will be a great work dress for the spring/summer. my only complaint is that the petunia is more purple than blue.  i wish i'd ordered the navy/white instead, and now they are out of my size :(  still, a lovely dress!