Who does not know it. You devote yourself to the beer and the party mood with full vigour, and what do you forget when you eventually go home? Right, your hat. So what can you do to wear a hat without wearing a hat? Wear the "Happy St. Patrick's Day" headband, that's right. Green, hat, shamrock , everything is united here and decorates your head . You can also be sure of one thing, "happy" is exactly the word here.