I'm sure they are. I'm also sure that the artist decided to go ahead and have EVERYONE at that party dress in tastelessly over-revealing outfits, for just such an argument. But as that's equivalent to hiding a cobra inside a snake pit, I don't think it signifies.
Consider if you had an entire society party drawn by Jim Balent. There would be fabric enough for approximately one person's tasteful outfit spread across twenty-five women, and you know it. Does the sheer number of uberboobed skimpily-dressed females make it appropriate dress for a society party?