Harley-Davidson® Men's Cotton Skull Ivy Cap, 99471-10VM. Not just for the meek, H-D® ivy caps are a powerful style statement for the true rider. Willie G. Davidson loved and still wears the ivy cap. It might be said he alone popularized the style for Harley-Davidson®. Made of 100% cotton, the caps are fitted, come in sizes from Small to X-Large. Willie G’s skull logo design is embroidered on the front of the cap. It’s distinctive, and timeless. Made by Harley-Davidson®. Manufacturer Part Number, 99471-10VM.