Size up!
I got four dresses to try on for prom all in large and this one I could not zip up, even with help. It's good material and cute for business casual or homecoming. I did end up sending it back because I liked one of my other dresses more but it was super cute anyways.
Response from Lulus.com:
Hello Mia! We're sorry to hear that this dress fit smaller than you expected. If you would like additional insight regarding sizing for future purchases, please reach out to our team of fit experts (lulus.com/customerservice). We want to help you shop with confidence! Thanks for your review! XOXO