Where can I find out more information about the traditional Chinese Hanfu dress and its history?

I think the best way to find such information is to google it or to look at some blogs about Hanfu, such as this one https://store.newhanfu.com/blog , where you can find a lot of interesting information about Hanfu and its history, as well as the application. I would recommend you to read this blog, because I have learned a lot from it.

Read about hanfu on wikipedia.