Haven't read the whole thread, but watched it twice. Second time with DH and I asked him what he thought afterwards and he immediately said the message was "wear clothes from HN and you won't look like a slut." He thinks it's awful.
I don't see the point of it at all. They could have made the same point without making such a distinction between class. And it's not just the dress that's so obviously different on the HN woman, it's her hair, her makeup, her demeanour, her obviously different demographic.
Just crass.