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I know this probably isn't the answer you're looking for but since it is for prom, you could take this picture to a tailor and have them make it from scratch. It would look exactly like the picture! A little expensive but it is prom after all. And the dress would probably cost a lot anyway, even if you were to find it. It looks very expensive. Anyway have a great time at prom! :)
dress: $399 crazeparty.com
dress: $218 / SinoAnt.com sinoant.com
dress: $260 etsy.com
I think it's jovani.