Turns out clowns are based on some legend from Iceland (or Norway or somewhere. One of those places) and this suit was the original clown suit made from the skin of some form of demonic 'Clown Zero'.
Anyway, it possesses Mr Kindly and he starts metamorphosing (is that a word? Spell check says it is.) into an evil child murdering demon clown.
That's pretty much the film in a clownshell, it was more entertaining than I thought it would be. Reminded me of some of the better '80s horror flicks.