Make a wizard's hat inspired by Gandalf the Grey, a leading character in J.R.R. Tolkien's epic fantasy series "The Lord of the Rings." Based on the costume worn by Ian McKellan in the film version of the series, this wizard hat can be worn as part of a Gandalf the Grey ensemble or for any witch or wizard costume.
Roll one sheet of poster board into a tall cone shape that fits comfortably on your head. Staple the overlap to maintain the size. Trim the bottom edge of the cone into an even circle with scissors.
Make a brim for the hat by cutting 6 mm (1/4 inch) slits 2.5 cm (1 inch) apart all the way around the bottom edge of the cone. Fold the slitted tabs outward.
Measure the inside diameter of the cone. Mark the measurements in the centre of the second sheet of poster board, forming a circle. Mark the midpoint of the circle's diameter.
Anchor a compass at the midpoint and create a circle following the marked points. Widen the compass until it is almost straight and trace a wider, concentric circle around the first.
Cut the big circle out of the poster board, then cut the smaller circle out of its centre. Place the cone upright on a work surface, with the tabs opened outward. Squeeze a small amount of glue onto each tab and slide the brim over the cone. Press the tabs in place to support the brim. Allow the glue to dry thoroughly.
Cover the cone in grey felt to give the hat a rumpled appearance if desired.