Where are there anime conventions where you can dress up like naruto DBZ or air !
Question: and get the materials for the costumes
Answers: and get the materials for the costumes
well you can dress like that at any anime convention.
and well i dont know where you live so i dont know where the closest con is for you. so if i were you i would choose the nearest biggest city to where you live and google the name of the city + anime con. i am sure you'll find something.
as for the gear, i would recomend learning to sew, or googling the character you want to be plus the word costume and i am sure you can find a place that sells it. you might have to import it from japan, but eh if you are into it it might be worth it.