I ordered this dress for New Years Eve. I was a little hesitant about ordering it based on some of the reviews that said it was "painful" due to the scratchy sequins. I ended up getting it despite some of the negative reviews and was SOOO HAPPY that I did. It was perfect for NYE. It was not THAT bad - yeah, maybe a little scratchy on the edges of the sleeves but you can handle it. It is such a cute dress and I was getting compliments left and right. I am 5'1" and about 110 lbs. I ordered a XXS and it was great - an XS would have been too big and too long on me. The dress is pretty stretchy/form fitting. If you want it a little lose like the photo of the model, definitely order a size up.
This dress is really cute, however, it is super short, so just be aware of that. The real problem with this dress is comfort. The lining does not go all the way to the bottom of the sleeves or the bottom (where the seams turn over), so the sequins scratch to the point where I came home from a night of dancing with rugburn-looking marks on my arms and legs. Will take the dress to a tailor to see if they can fix it, but otherwise unwearable. This is the first item I've purchased by Backstage... cute but designer needs to consider wearability poorly designed/tested.