Hachi is a very large and rotund man. He wears a green tuxedo with a yellow bow tie. He has a pink mustache and hair with a black crossbone design in the center. During his time in Soul Society he wore a long purple mantle over standard Shinigami robes and his hair was styled into two small horns with black tips and he has the emblem of the Kidō Corps in the center.

Source: Bleach Wiki