They could be a sleek black ninja outfit with red accents. Maybe it has a high - collared jacket for a cool look and some new ninja sandals with better grip.
His new clothes might be a traditional - style kimono but with a modern twist. It could be made of a shiny, silver - colored fabric that is resistant to damage. The kimono might have orange and white details, like the color of his hair and the symbol of his village. And there could be some hidden pockets in it for storing his ninja tools.