A look I completed a while ago, and since Halloween is fast approaching I thought I'd post it and maybe a couple others in the lead up. Products and tools used listed below...
Ben Nye Clown White
Mehron Starblend Cake Makeup in Black
Angled liner brush
Filbert brush (small and large sizes depending on area)
Buffing brush (for clown white)
Blending brushes (dome shaped - medium sized)
You can use anything you'd like, this is just what I personally found made it the easiest.
You can see I didn't bother with any hair or costuming, but for the hair I would just mix hair gel and whatever white paint you used together and run that through.