This lovely dress is called RARE inspired by Mc queen. I don't remember when it came out, how long it was in the shops or how much the original price was because the dress is really old. All I know is that it's tagged RARE and Fallen Angel. They used to be cheap, you could get them for 15$, but now they're more rare and expensive.
Now to the real life version. As the name of the dress says, it's Alexander McQueen. A bit different in real life, partly transparent, but still looking the same. Here it is: