Billabong Mull Leaf Short Sleeve Shirt ROCK Österreich. Throwback in style the 73 X Mull leaf takes a Billabong re-issue print und gets itself dressed up for any occasion. Grab it for happy hour or for seaside weddings. Get dressed up without loosing your surf spirit. Short Sleeve Button Up Shirt. Mull Leaf print. Colors: Rock. Materials: 100% Cotton.