The White Suits is a gang of Ghouls within Aogiri Tree, named for the distinct style of clothing worn by members.
The gang was initially made up of the subordinates of Aogiri Executive Yamori, though did not seem to be an official group at the time. In the two years since Yamori's death, Naki has expanded the group from its original three members to a much larger gang under his command.
The White Suits are among those sent to the Auction to provide security, and charge into battle when CCG begins their operation. Under Naki's leadership, the group quickly gains the upperhand in the battle, before being confronted by Akira Mado.