Skullcap/ˈskʌlkæp/ Definition 1 of 3Pro Tip 1/3Clothing Item Understand it's worn as clothing on the head, often for warmth or fashion. She chose a colorful skullcap to match her winter coat. Pro Tip 2/3Casual Accessory Generally casual, not suitable for formal events unless part of a uniform. He swapped his formal hat for a casual skullcap after the ceremony. Pro Tip 3/3Unisex Wear Skullcaps are worn by people of any gender, adding versatility to personal style. Both men and women at the skate park wore skullcaps.