(You should have seen the proud look on his face.)
Hey, it parallels the original name in so many ways.
How to make a Wee Wee Wigwam?
Then sew the curve of your half circle flat, very close to the edge.
Then fold your half circle in half, with right sides together. Sew right along the raw edges, with another 1/4 inch seam allowance. Then sew another seam, using your zig-zag stitch. Trim any edges if necessary.
Then make a few more and use them or gift them to a friend.