Bustle dresses are fun! I think of them as the OG of twerking cause they bounce when you walk. XD
IMO = in my opinion
Uhh... favourite period of clothing... very difficult. But if we stick to Western Europe, any kind of bustle dress, either from the original 1770/80-ish or it's more known return from 1860 to 1880-ish (Interview with a Vampire XD). I like the opposite of tight-fitting upper part and wide lower part. And I think every woman loves a dress with a train. *__*
I haven't found yet a video. But there is a link to a picture regarding the change of Chinese and Vietnamese clothing over time in the reference material category. Unfortunately, the website of those pictures doesn't exist anymore. I might try sending a mail to the e-mail-address you can see there. Imo clothing didn't change much due to social standards. You never see knee-length clothing. The cut is also mostly the same.
The thing with drama clothing is, they stick to the most commonly known time periods so they can reach a wider viewership, especially in Chinese dramaland. But for China also and mostly because of censorship and the Chinese... hm... view? paradigm?... that everyone needs to be the same, namely Han Chinese, though there are about 45-ish different kinds of Chinese. A very good example is the recent drama "First Sword of Wudang", an old-school wuxia drama which plays in the Tibet region and daaaang did they go all out on the proper ethnic costumes. It is the part I love the most about the drama. Second place takes the scenery which is 90% of the time real landscape, no green screen as you usually get in C-drama.
So, Korean drama mostly use costumes from the Joseon time period (it's a rather long time period) and Chinese drama mostly Tang dynasty.
I would love to own a book about C/K/J clothing periods but unfortunately such books have a hefty price, especially if they go into detail. >_<