Could you please help me its devolping on imvu?

To make a completely original item you need to make your own mesh, This requires Max3D or Blender. Some hairstyles allow you to change their mesh slightly as in the length. As for using derivables, its not copying to use their mesh, they are giving you permission to use it for a fee, you simply change the texture of the product. You can add so many effects to the hairstyles that you can create a look that can be your signature. Good luck,