Modification of this mod https://www.gtainside.com/en/gta4/skins/181703-ned-peppers/ uploaded by dayaisalilbitch
How to install :
make sure you have OpenIV or SparkIV
Go to :
Grand Theft Auto IV\GTAIV\pc\models\cdimages\playerped.rpf
Drag and drop the file

Tyler, The Creator GOBLIN outfit included : The green mask and the blue Supreme Hoodie