Costumes

The uniform for the killer is meant to be fairly dark, due to the dark nature of his actual character. However, the premise of the film is that the audience shouldn't know whether or not his character is acting out of a sense of justice or revenge (and thus in some ways is morally right), or if he is acting out of madness. They shouldn't be able to tell either way, in either the way he acts or the direction any of his elements are, including the costume. Due to this, some parts of his costume should be fairly light, in order to hint at a possible just side to him.

The victim, played by Tom Cartwright, is made to be a polar opposite of the killer - his clothes are informal, consisting of jeans and a white t-shirt, but again his costume has been designed to have both light and dark elements, so that the audience isn't thrown either way as to whether or not he's actually deserving of the murder or not. Again, the costumes have been kept with the state of the audience in mind - we don't want them to have made conclusions as to the motivations of the killer through false signals.

The other people shown in it aren't of much importance, so not much thought has been given to what they'll be wearing, except that they'll be wearing informal clothing. To keep the last shot in particular fairly realistic however, we're having a party in which the film will be shot, so formal clothing is going to be avoided. A high amount of contrast should be shown between the scenes and the costumes, and it should be clearly noticeable by the audience.