You can now right click on your knife and craft all clothing skins available at the traders. *DISCLAIMER* Before you do this however put your backpack into your safe/vehicle (empty the contents first though) and do the same with your radio. Then craft the skin you want with the knife until you find one you like and put on your backpack again and retrieve your radio. If you do not remove your backpack/radio prior to doing this they will be lost forever!