Net-a-porter has this beautiful Chloe dress in plum that I love! I would never spend this much on a dress though...
Chloe Strapless Pleated Silk-Blend Dress, $3,015
That is just a ton to spend on a dress! For that, you do get some nice tailoring - the all-over pleats, built-in corset and bubble hem. Also, for this price, I suspect that the belt it comes with is of the super-nice quality of all Chloe leather items.
I love how they tempered the fanciness of the dress with the brown leather belt. It's like a dash of equestrian English country on a classic dress ...