What are people bitching about?
This is exactly how it should look.
Black tux, red cape, red hood.
What were you expecting it to look like?
The only thing I have to say is I wish the purple vest/gloves were red and that he had a rose instead of that other flower.
I don't see how you can complain about it looking similar to his other costumes, the Joker wears suits and tuxedos, He wore a tuxedo as the red hood, tuxedos don't come in a drastically wide variety. Slim tuxedos on a slim man will look damn near the same no matter what color they are.
Overall, it's a good costume.