How to import unusual or strange effect of weapon's and hat's in Blender 3D?

So, I imported the Demoman, weapons and cosmetics in Blender, added textures and imported a part of pl_upward (I just need to find the textures that the part/faces of the map uses). Now, I want to know how do you import the unusual or strange effect on weapons and hat's into Blender or do you need to recreate them by your self?

How to import unusual or strange effect of weapon's and hat's in Blender 3D?