This color blocked two-piece Rachel Allan 7513 prom dress takes things up a notch with its gathered bust, halter neckline, and full A-line skirt. We are loving the asymmetrical seam on the front of the crop top, as well as the tiny cutout at the empire. Taken in at the shoulder, your arms will look a mile long. There is also gathering under the bust and an open back to keep this look unique. The floor length A-line skirt is gathered and full with hidden side pockets to stash your stuff.