I know it's not the same dress, but it's definitely something Lwaxana would wear (but surprisingly never did).
Edit: The dress:
I actually really like lwaxana. I like her because she's flawed.. A little self absorbed. But always adventurous. A little dramatic and most of all almost always confident except in her vulnerable moments.
She's not a great person. A little toxic at times. But she tries. I think she has a good heart. She's more relatable than most of the perfect Starfleet characters.
And I like the flashy costumes.