This dress is super cute. I have a feeling it will be my new go-to. But, for my petite girlies, it runs large.
Per the size chart, I am an XS but the XXXS is what fit the best. For reference, I am 105 lbs, 5'1, 30B, 25 waist.
In the XS and XXS, the arm holes were a little big, the neck of the dress gapes a bit, and of course the length and the length of the waist were too big. So, after trying on the XS, XXS, and the XXXS, the XXXS is what fit the best. The length is still long for my 5'1 frame but everything else fit better.