See this hat? Do you see? It has actual magical powers and makes anyone in its vincinity experience actual happiness!
It must be made from some extinct, madly extatic animal. I imagine some sort of joyous weasel with solid gold teeth, living off truffles and champagne.
I know I will probably have to sell this one day (what with the selling things and eventually making some money being the main idea behind setting up a shop), but before then I must devise a way of bottling whatever blissfull essence it exudes.