In America it is custom to wear Green for St. Patrick’s day. And ironically the color green is a sign of bad luck and is very unlucky in Ireland. It is mostly associated with St. Patrick’s day because green represents the color of Spring. It is said if you have Irish in you you should wear green and then other’s say everyone has a little Irish in them so everyone should wear green because in America it has been said to bring you luck…the Emerald Isle