Frederica Tenjuin from Psyren in Crimson Style.
Personally, Psyren is a series I had never heard of before, and I think many people might not know it either. While searching for reference images of the character (spoiler: there are very few), just to get an idea of her outfit, I noticed that most of the images I found didn’t even show her full body.
Crimson-sensei gave her his own interpretation, and I tried my best to replicate that version. I hope I managed to achieve it — I’ll leave that up to those who decide to use her, or at least to the few people who even know her, hahaha.
Anyway, have fun.