She is wearing black leggings and a black hoodie, but she brightens it up with the girly red flowers on her shirt, which also works to cover, and accentuate at the same time, her butt.
Then she pairs the whole outfit with another splash of red, thanks to her good looking bag.
The booties are kept muted so that they don't interfere with the simplicity, and her red hair adds one last vibrant note to this well balanced tune.
Well done. :)