Small too small, Medium too big.
I ordered a Medium and the arms/sleeves were baggy, I didn't think it looked great and it was a little big in the back around the waist, so then I ordered a Small and it was way too small. The dress and the price are great though and if you loved it would be worth altering if needed. I personally didn't like it enough to spend the money on altering the Medium. The white was too bright for what I wanted.
Response from Lulus.com:
Hi Stephanie, thanks for your review! We apologize that the fit of this dress wasn't quite right for you. Our fit experts (lulus.com/customerservice) are available to provide personalized assistance for all of your sizing needs. We're in the office daily, and would be happy to help! XOXO