Dracule Mihawk

Dracule "Hawk-Eyes" Mihawk^[3] is a member of the Shichibukai and the current holder of the title, "Greatest Swordsman in the World". Mihawk serves as Roronoa Zoro's swordsmanship teacher during the two-year timeskip.
Mihawk is a tall and lean man with a short beard and sideburns that point upwards. His nickname comes from his strangely colored yellow eyes, which resemble a hawk's eyes.
His attire consists of a wide-brimmed black hat decorated with a large plume; an open shirt with a red-violet collar and sleeves decorated with flower patterns, leaving his neck and chest bare; a black vest and cape, colored red-violet on the inside; and white (light purple in the anime) pants held up by a decorated belt and tucked inside large boots. He wears a kogatana around his neck, appearing as a golden cross-shaped necklace, and carries Yoru on his back.
At his home in Kuraigana Island's castle, he sports different pants and an open white shirt with a ruffled neck. When he met up with Zoro outside, he had a plain dark cloak draped over his shoulders.
In Volume 63 SBS, Oda drew the Shichibukai as children. Mihawk is shown with many scratches and bruises from training. He used a bokken as his weapon. He dressed in a dark-colored open jacket, short pants, shoes and a light-colored belt.