A: The dress is vintage Azzedine Alaia so unfortunately, you can’t get it.
Of course, one of the most famous fans of Alaia was Cher Horowitz in Clueless (it’s the dress she’s wearing when she gets mugged).
Remember the scene? The mugger tells her to lie down and count to ten so he can make his escape and she says something to the effect of, ‘Oh no, you don’t understand. This is an Alaia.”