Cassie Sandsmark aka Wonder Girl from DC Comics. This is her red outfit from the Teen Titans run, along with the shirt and jeans look.
Triggers:
Red Crop Top: wg2, blonde hair, hairband, bangs, blue eyes, earrings, crop top, pants, vambraces
Shirt: wg2, blonde hair, bangs, blue eyes, shirt, armor, three-quarter sleeves, midriff, jeans, belt