To get your PC Rocket League items on your PlayStation, you'll need to link your Epic Games account to your console. First, make sure you have an Epic Games account and that it's the same one you use on your PC. Then, on your PlayStation, go to the Rocket League game and select the option to link your Epic account. You'll be prompted to enter your Epic account credentials, so just sign in with the same email and password you use on your PC. Once you've done that, your accounts should be linked and you should be able to access your PC Rocket League items on your PlayStation.