Luffy is renowned for his trademark straw hat (from which he gets his nickname "Straw Hat Luffy"), which was lent to him when he was young by the legendary pirate captain, "Red-Haired" Shanks,[21] who in turn received it from Gol D. Roger.[22] He wears short, blue trousers with cuffs, sandals, and a sleeveless red vest. Luffy also has a scar with two stitches underneath his left eye (which he earned by stabbing a knife under his eye to show Shanks that he was tough)[23] and short, messy black hair. He was severely wounded by Akainu in the Battle of Marineford,[24] leaving a large X-shaped scar on his chest.[25] Appearing to be scrawny underneath his shirt, he has a surprisingly well-built physique. He is quite short since he appears dwarfed by most individuals in the series.