This Pokemon Ash Ketchum costume for kids is not only easy to put together, but perfect for kids who would also like to set off on a Pokemon catching adventure! For this costume, make sure that your cap is red and has a white center with the green triangular detailing on the front of it. You should wear a black short sleeved shirt underneath with a white short sleeved dress shirt and a blue vest to go on top. Wear some comfortable jeans and some nice black sneakers and you’re done. If you want, you can accessorize your Ash Ketchum costume with the green gloves and the small Poke ball.