Step 1 - Play until you get the red crank.

Step 2 - After getting the red crank use it on the door that it is needed for. Then do a quick turn 5 times. Do a full 360 then look up all the way then down all the way.

Step 3 - Exit the game and open up another game that starts with the letter S.

Step 4 - Exit that game and open task manager.

Step 5 - Take a peek at your RAM usage then close task manager.

Step 6 - Go back into Re2 and start a new game on assisted difficulty.

Step 7 - Make your way to the first typewriter and overwrite your previous save data.

Step 8 - Exit the game.

Step 9 - Open Re2 back up.

Step 10 - Go into the costumes. It should be there. Voila!