Marios famous hat as designed by Pixel-Kakashi. A couple of recolors have been made of this, as such, there is now a Luigi and Wario version available.
The finished article is quite large, not large enough to be worn by an adult but it's the perfect size for any little mario fans that you may have in the family. But since mine is currently hanging on a wall, neither matter much to me
Get it (and the recolors) here [link]