My comment:
(a) The report is based on
Leo Lewis, Beijing’s censors reduce a full-bodied costume drama to flat screen TV. London: The Times, Jan 6, 2015. www.thetimes.co.uk/tto/news/world/asia/article4314741.ece
, which is behind the paywall (except the first 2 1/2 paragraphs).
(b) I wonder whether women's costumes in Tang dynasty had low cut. Indeed some had. See 李仙蕙
zh.wikipedia.org/wiki/李仙蕙
(photo legend; "唐朝仕女图——永泰公主陵壁画")
* The same photo appears in
women's clothing in China
en.wikipedia.org/wiki/Women%27s_clothing_in_China
, where the legend of the photo is: "Tang court ladies from the tomb of Princess Yongtai in the Qianling Mausoleum 乾陵 [所在" 陕西省咸阳市乾县], near Xi'an in Shaanxi, China. 706 AD."