I will echo what everyone has said about this being Very Very small.  I bought this for my daughter who wear's a girl's 10. I followed the size chart and the recommendations from other reviews.  I ordered a medium and it fit comfortably.  I just had to shorten the straps and it fit perfectly.  The fabric has stretch to it so it would stretch to fit bigger as well.  The dress turned out gorgeous and she got many compliments.