The idea comes from the Pony LORA
https://civarchive.com/models/637689/ponystar-dress-flora-battle-girl-high-school

Major tags: star dress flora (for normal images), star dress flora change (for henshin style images)

If you want to generate a dress more like a specific character, add the name after the tag, i.e.
star dress flora miki
star dress flora subaru
star dress flora haruka
star dress flora misaki
star dress flora nozomi
star dress flora kurumi
star dress flora yuri
star dress flora kanon
star dress flora shiho
star dress flora asuha
star dress flora renge
star dress flora anko
star dress flora sakura
star dress flora hinata
star dress flora kaede
star dress flora michelle
star dress flora sadone
star dress flora kokomi
star dress flora urara
star dress flora mari
star dress flora itsuki
star dress flora furan
star dress flora erica
star dress flora aoi

Special version is also included, however the result may no be so good:
star dress flora miki jk3
star dress flora kurumi dark
star dress flora anko dark
star dress flora hinata dark
star dress flora mari dark

For details tags of the dress for each character, you may refer to https://civarchive.com/collections/78273

To generate better henshin images, consider to add "torn" series tags, e.g. torn bodysuit, torn skirt, etc.