This is my ball dress. I don't have it but I want it!

I cannot find a website where this is available and well legit. I've discovered blissfuledge and luulla where this dress is available but I'm not sure of the legitimacy. If you can ensure me that these sites are legit and good quality then that's my search done but I doubt that.

I don't want dresses that are similar I want THIS dress! (Sorry if I'm sounding mean, I just REALLY want this dress please someone help me!!!)

I've tried reverse image searching it and haven't came across much. Please please please someone help me!