I've not had many guesses on this, so I thought I'd just reveal it for anyone interested :)

I'm sure a lot of people have figured this out, but just in case:

So, you can have the promts for your character. And if you want them in someone's outfit, you can just add the characters name and the word outfit.

Example: (Anara promps), ruby rose outfit.

This would get you Anara in ruby rose's outfit (3 out of 4 times).

For this, I used a prompt of Myne (honzuki no gekijou) outfit. And it puts her in a blue robed outfit, and sometimes the hairstyle.

So yep, Ascendance of a bookworm outfit and hairstyle to get that look on Anara ;)

Hope you enjoy a few additional pics ;)