Nice quality, excellent fabric choices, and sufficiently versatile, this little dress is both dramatic and cute. I'm finding it quite challenging to tag this under a very precise style, Gothic Lolita hitting the closest to home, perhaps. It depends a lot on what one would be pairing this with in terms of accessories or additional clothes such as a long-sleeved shirt - without which, by the way, this might be considered even Ero Loli. Bare shoulders and all.
The buttons are fake, for convenience's sake, but I think it would actually have been a nice finishing touch had they been functional.