When
Glen Murakami first designed Beast Boy's purple and black costume for the series, it made him think of Mento's modern black and purple costume. He wanted each of the Titans to have a specific color scheme, that's why he changed Beast Boy's costume from red-and-white to black-and-purple. By doing this the Doom Patrol's uniform was changed to black-and-purple in this series instead of red-and-white like in the silver and bronze age comics. This also confirms that Beast Boy wears his old Doom Patrol uniform, sans mask, as he did in the New Teen Titans comic book series.