Todd appears in all Wayside episodes, and in all the books too.
Todd wears a blue shirt with white sleeves underneath, green pants and red shoes. In the episode Rat in Shining Armor, Todd wears a car dashboard costume, and for sports day he wears a sport suit and black shorts.
In the books, he wears a green shirt. In the chapter "A Story That Isn’t About Socks", he was wearing white shorts, a Hawaiian shirt and sunglasses.