Bunny girl in this Panty & Stocking Cosplay picture is Hiko, she played as one of the main characters of Stocking of Panty & Stocking with Galterbelt Anime Series, her name is Stocking, she gets her name from the object she is Able to weaponize, she can change her stocking into stripes dual blade.
Stocking looks different from her usual appearance that always identical with Gothic Lolita style, in this Panty & Stocking Cosplay picture Hiko wearing hot bunny girl costume that makes Stocking look maturer, i think its won't hurt to see a cute child-like Stocking who grew up like this.