Hmm... Never thought of that...Ohh, I can't choose Riley's costume that Ash wore in the Lucario movie - that's my all-time favourite Ash get-up. I guess I'll have to say the original Kanto costume, mainly because it's the one I'm most familiar with and it's totally iconic. I like how mad Ash got in the Primeape goes Bananas episode when his hat got stolen by Mankey. Plus Misty looks amazing with Ash's hat on