Misaka Misuzu wears clothes and perfume from various brands.
Zero Plus (ゼロプラス Zero Purasu?) is a perfume brand that exists outside of Academy City that markets toward teens. They are apparently famous enough for the likes of Accelerator to notice that they are for teens.
Misaka Misuzu wears the perfume alongside other brands for teenagers for her clothes, such as Az, Elmo, Scale, and Russiv.[1][2]