Used to be a mod that added a lot of customization, outside of that probably going to be a long time before we get any more outfits for the existing girls, since the patreon always votes for more girls over stuff like fleshing things out, if I remember correctly.
The Null Hypothesis is another X-men game and they are adding new outfits and stuff pretty regularly, only 3 girls for now but might be worth a look, if you want to check it out.
https://f95zone.to/threads/the-null-hypothesis-v0-5b-ron-chon.138294/