To uninstall, remove the extracted files
Alternatively, you can use Simple Pakker to pack yourself a 'Data3.pak' (just follow its instructions - but I still recommend WinRAR) pak files the game is using they are actually. (you need a tool like WinRAR to open and manipulate. If you are using other mods, place the data folder in the archive to your '.Steam\Steamapps\Dying Light\DW\Data3.pak' file If you are not using other mods, then place the 'Data3.pak' file within the archive to your game folder ('.Steam\Steamapps\Dying Light\DW\') (you can find your saves at '.\Steam\userdata\*number*\239140\' folder) Not for just this mod, but for any game that you use mods, back your save files up first - and back the entire folder!
Third one I named 'Mercenary' as you look like you are loaded. Second one I named as 'Battered Clothes', as it looks torn apart.
First one is the 'Dirty Clothes' as the game calls it, which you get to see in prologue and in main menu. More Outfits is a mod for Dying Light, created by lyravega.
