Four-Leaf Clover

From Wild World Wiki

The Four-Leaf clover is an item that can be used in multiple different ways. It can be found (very rarely) by pulling up a patch of clover, which appear in exactly the same way as weeds appear in your town.

The clover can be used as headgear (placed behind your ear) and as furniture (used as some kind of bookmark?). It reportedly brings you good luck.