Mimi, my grandma, used to call it "Greenie Day" and she would show me this lovely shamrock pin. It never had the tag removed until I got her jewelry. I now wear it every "Greenie Day" to celebrate St. Patrick's Day and to remember my grandma.
I hope you remember to wear your green and if you don't, I hope you don't get too many unwelcome pinches ;)
Happy St. Patrick's Day!