The gown is by designer Cary Santiago. His pieces are really exquisite and expensive. I am very lucky to shoot some of his pieces. But like what you said, the dress on the photo is quite heavy and hard to sit on. I never really consider this as a wearable piece, like something that you would wear in a party but rather more like a piece of art. This is definitely not your average gown.
Well, that much is evident. I don't particularly see much a point in an "art-piece" gown, other than it's "pretty". But again, being somewhat male about fashion and it's... extravagances? I mean, I prefer something wearable, and well practical too and am kinda out-of-style in what I like to wear. I think it's a shame that this gown will probably just hang in a museum some where. I think clothes "want" to be worn, if that makes sense at all. Besides, think about all the material that went into that, that won't go into something people wear? I guess when I'm a fashion designer, I can have something to say about it then! XD