i've used a1111 for many time, but i've switched to CUI.
So some possible answer:
1) you can train Lora with result image, but result is not sure. Lora train is not so simple, understanding every value for training, and all settings is not so simple in the begins, but you can try and see. Experimenting is the way. For train lora i suggest to use
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2) in the same way for face, you can use lora for dress.
3) not prompt, there are some extensions doing it, but i checked it only on CUI, i can't point to right extensions for a1111 because i never checked on it.
A1111 is good and i had a fun for many time, but CUI is more powerfull for me, that node UI permit some workflow that is so difficult to remake in a1111. But this is my opinion, there are many skilled people's and everyone work good on UI they use.