My background is 3d rendering and I started using Unreal just about a year ago. I can’t help you with all the subjects and my knowledge and workflows are probably not the most advanced.
For the cloth and hair you could simply use allembic data created in a third party software, for instance I animated a character within Clo 3d and exported the whole clothing animation as a single allembic file. Same can be done for hair I think and also capes 
I did a bit of research for facial animation, I don’t know how to do it straight in unreal but with the use of Iclone and some plugins you can easily capture your own facial animation on a character.