Tosa is a Marine Vice Admiral and one of the nine that took part in the Egghead Incident.
He is a big burly man with a big roundish beard. He has huge hairy muscular arms and big hands. He wears a cap with the word “MARINES” on, as well a dark t-shirt, light pants, dark boots. As a high-ranking officer, he wears a Justice coat draped over his shoulders.

(Source: One Piece Wiki)