Instructions
Turn on your PS3. Select the "Playstation Store" option in the PS3 main menu.
Select the "Add-Ons" option in the Playstation Store main menu. This will bring up a list of games with available add-ons.
Select the "LittleBigPlanet" option in the add-ons menu. Select the "Ghostbusters Costume Kit" option in the next menu.
Select the "Download" option to download the kit. If you do not have enough points in your Playstation Store account, you will be asked to add more. Use the information on your debit or credit card to add more points to your account, after which the download will continue.
Press the "Circle" button repeatedly to exit the Playstation Store after the download has completed. Begin playing "LittleBigPlanet," and you will find the Ghostbusters hair along with any other hair items you have found or downloaded in your character's menu.