Print out this template and make your own BAC! 10th Birthday Party hat. Right click on the image below and choose to save it or print it. Print it onto a full sheet of paper. For a kids-sized hat, photocopy this onto a legal-sized sheet of paper, enlarging it by 25%. Cut the semi-circle out on the black lines, roll it into a cone which will fold the straight edge in half, and then glue one side of the straight edge under the other side and let dry. Staple both ends of a thin piece of elastic onto opposite sides of the bottom edge of the hat so it fits under the chin. You have a BAC birthday hat!