In central IL, it always ends up being cold on Halloween. I often would buy a cheap sweat suit as the base of a costume. For a two year old you can buy a sweat suit and some felt. Cut the felt into circles and tack to the sweat suit. Roll poster board into a cone, add more felt circles and you have a hat. A bit of face paint and you have a clown. The best part is when you get home, take the felt circles off of the sweat suit and it is still fine to wear all winter.