In maeve i run between a size 2-4.  my regular size 4 was too tight in the shoulders, the fabric didn't drop off the shoulders like it does on the model.  it also felt too tight near the back were the button is, almost as if there was not enough fabric.  the sleeves were also too short and tight around the arms.  sized up to a 6 and all those issues were fixed.  since this top is billowy anyway the size up really didn't mess with the shape of the top.  love the gold color, so pretty!