Recently I found an amazing dress on two screenshots from a Moonshadow Elves mod for NV.
As I was unable to receive an answer from the mod's author, I decided to post a request for skilled modders to create a similar clothes to the ones seen on those screenshot.
This is how it looks like:
The second screenshot can be found under the screenshot section of the Moonshadow Elves for NV mod, which can be found here
I really hope someone can create something similar to this one, because I think it looks awesome. I was unable to trace where are those clothes from, therefore I can't offer much help.