No, the fishnets do not work for her character imo. I have never subscribed to the "iconic" argument. I don't care if they're "iconic," they're still stupid and in no way fit her character. She's a street-level vigilante a lot of the time who frequently engages in strenuous physical activity, jumping and running around, and relies heavily on her hand to hand fighting skills. Sorry, but fishnets do not work for a character like that, they're pretty much the worst thing that she could possibly wear under those circumstances. Zatanna gets away with it because she rarely engages in direct combat (instead relying on her magic) and she's a showman who has a flamboyant streak. It's not the same thing. If the only justification that people can come up with is that "they're iconic" then they don't have much of an argument.