On any scenario on the Normal difficulty, get to the RPD precinct without picking up any items. Before entering the RPD, head down the nearby stairs in the entrance courtyard and you will come across a zombie that was once Brad Vickers, the S.T.A.R.S. Alpha Team helicopter pilot from the first Resident Evil game (if you wish to know the events that led to his transformation into a zombie, play Resident Evil 3: Nemesis).
Brad has more stamina than a regular zombie and won't go down easily. However, keep firing at him and he'll eventually fall. Once you have done so, examine his body and you'll pick up a special key.
Once inside the RPD, head to the Darkroom once you have opened the hallway doors with the card key that Marvin Branagh gave you and examine the lockers. Use the special key on the lockers and you will be able to change your outfit. Leon gets a different police uniform and a hippie-like costume to choose from. Claire gets a cowgirl outfit and a new gun.
You can change your uniform to default any time you like.
Added by: Volke Apr 8th 2009, ID#6355