Surprisingly, we do already have a costume! On a recent thrifting trip, my 3 year old spotted a little pumpkin bunting outfit and said, "This will fit the baby, Mama?" I couldn't resist the $1 price tag on that one, and that his big brother picked it out. My 3 year old on the other hand, no costume yet...I have to wait till the last minute, otherwise he'll switch it on me. "NO, I don't want to be a turtle anymore! I want to be a fish now!"