During DLV 2014 I found out about a new Dress Shoppe at the Cosmopolitan Hotel.
The Cosmopolitan of Las Vegas, 3708 Las Vegas Boulevard South. Las Vegas, NV 89109 (702) 698-7000
On the second level, there is a club called the "CHANDELIER" {IS A LIVING, BREATHING ARCHITECTURAL WONDER CREATED BY LUMINOUS BEADED CURTAINS OF LIGHT.}
Across from this club is the Rent-The-Runway Dress Shoppe. You can rent designer dresses for the night for around $50-75 and up along with accessories ( not shoes).
https://www.renttherunway.com/ourrunway
I tried on several dresses while I was there with styles that are very different from what I would usually select. I was treated well by the girls who worked there and would try this again sometime. They didn't have many larger sizes, though, so call ahead if you want to try on plus sizes.
Enjoy!
Dionne kandi Piper