Ash Ketchum Costume
You need the following items for your Ash Ketchum Halloween costume:
Dress Like Ash Ketchum From Pokemon

Dress like Ash Ketchum from Pokemon;
Ash Ketchum Jacket: Ash's outfit changed through the series. As the most famous pokemon trainer you need Ash's jacket which is blue and white and short-sleeved.
Ash Ketchum Jeans: Ash wears a pair of light blue classic fit jeans.
Ash Ketchum Shoes: Ash's sneakers are white and black.
Ash Ketchum Accessories: To complete your Ash Ketchum cosplay costume don't forget to get a pokemon ball and Pikachu plush.
Ash Ketchum Cosplay

Ash wears a white and blue short sleeve jacket with gold trim, a dark teal shirt with a white collar and sleeves, blue jeans with light blue cuffs, black and white sneakers with red dots, green fingerless gloves with light green edging. and a red-white cap with a green stylized "L".
Ash Ketchum Halloween Costume
Ash is a skinny, slender boy with dark black hair, light tan skin, and brown eyes with two lightning-like markings underneath each. Ash's pupils weren't visible during the Indigo League and throughout the Diamond & Pearl series until the Best Wishes sequence made them deeper and more distinctive.
While Ash wears several different outfits, he always wears a baseball cap that changes according to the region he's in. Hatless, Ash is shown with a hoodie and a tight, triangular, edgy strand of hair in the middle. forehead from a point on the right.