I love the style of the dress, just not the dress itself. Why?
The color is wrong, it would look better in an off white or champagne.
The material is wrong, it would look more structured, thus formal, in crepe or a heavier material.
That trim in the back accentuates the widest part of your body, and no matter how thin you are it's not flattering on ANY shape.
If you are going for an old Hollywood, glam, art deco type of halter dress you're on the right track, but not this dress.