What type of clothes do people wear in Japan?

It depends on the area of Japan you are asking about. Tokyo (mainland) Japan is very flashy, over the top and colorful. Think like cartoon bikers. In lower Japan, they are more conservative with mostly greys, greens, and whites with accesories in bright colors. Layers are very popular. The men mostly wear tight-ish jeans or loose slack paired with t-shirts or button down shirts. Trucker hats are till very popular here.