Velvety Viscount, hat for the demoman by PKSpark
hosted version for Gamebanana.

How to use:
Unzip, you'll see two folders: "Models" and "Materials"
Go to the skin "Models" folder.
Select the files by the name of the hat you want to replace
(ex. For Crown hat, select crown.dx80.vtx , crown.dx90.vtx , crown.mdl , crown.phy , crown.sw.vtx , crown. vvd)
Then copy/paste them into the path: 
steamapps/*yourusername*/team fortress 2/tf/models/player/items/demo
(create the demo folder if necessary)

For the materials, go to the skin "Materials" folder,
copy/paster all the files to the path:
steamapps/*yourusername*/team fortress 2/tf/materials/models/player/items/demo

That's all!