For reference, I am 5'5", 130 lbs. and typically wear size 4 or 6 (34DD-27-38).  I took into account the sizing chart + reviews, and ordered to size my bust. Because I prefer a classic fit to a tighter one and didn't want to draw attention to my bust, I ordered a size 10.  It's much bigger than I anticipated, but with a caveat.

Although the shoulders, waist, hip, and bust are all waaaay bigger than I prefer, the opaque panels that cover the breasts themselves is barely big enough to cover mine. So, if you are a bigger-busted gal, expect that you might have issues covering your breasts.  You would have to wear something to cover your nipples yet, depending on how high or low they are situated on your breasts, it would still possibly show through the sheer, unlined parts of the bust cups.

For mine, the opaque parts of the bust cups were barely the right size (a 1/2" smaller and I'd run the risk of people seeing my nipples) but that means the rest of the dress is huge on me.  Smaller-waisted/larger-reared women will find this to not fit as well as it could.  It's cut for a smaller-busted, larger-waisted (small waist to hip ratio) person.  It is cut like junior's clothing, really--not great if you are very curvy or hourglass-figured.  I could take in several inches everywhere--except it's not exactly a dress that would be easy to tailor, since there are sequins and tiered layers to the design.

That aside, the dress itself is surprisingly well-made and beautiful.  I'm not a flashy person and prefer more demure-looking clothing but, despite that, I still love the sequins.  I'll try to post a picture soon, because they are tastefully done.

I can see wearing this as a summer evening, cocktail/ or even a summer wedding dress.  It doesn't look cheap AT ALL.  I've been sewing for 35 years and am really a stickler about cheap clothing, and this one is shockingly good quality for the price!