I wore this for engagement pictures in the mountains. It's great for flowy engagement photos, prom, mother of the bride, bridesmaid, etc. There's an underlayer of fabric and the straps are adjustable and I was able to raise the neck higher than the photos. The size on the tag is a small and I generally order small or medium tops from anywhere and am a 6 in AE jeans.
Link to dress, size chart, and plenty more photos from other reviews: