The mythical culture that turned out to be real was called the Xia. It is the first dynasty in traditional Chinese history, which was established by the legendary Yu the Great.
Well sense it has to do with high class clothes, maybe like a royal blue suit with black sleeves and for girls maybe an long black and gold evening gown with beads
The answer is B) William Billings.
If you have any further questions feel free to ask.
Hope this helps.