What I actually have is a dozen hats ready for Christmas, as we're moving away from Christmas crackers.
Time to write an outline tutorial, in case I find that I need to make some more!
Fold a 1/4" for a tab overlap at one end, and then fold the rest into quarters. Mark 4 points for the top, and draw a line at 2/5" up the strip, and join the top points up with the line with 45 degree lines to make the crown shape.
I drew round the template onto interfacing and interlocked the patterns (with a slight offset at each end so that the points interlocked). I made six pairs. It's economical for your interfacing and fabric to do this.
Next I ironed the interfacing onto the wrong side of one of my fabrics, keeping the pair together.
Then, layer up with the second fabric, right sides together.
When sewing around the 'tabs' I made one closed and one open. Once the crown is turned through you can then turn under the edge of the open one and slot the closed one into it. It makes it quite easy!
Once the sewing is finished, cut the hats apart down the drawn lines.
Then trim off the points and clip the valleys, being careful not to snip through the stitching.