Here's some images, and the tute is below. Its my first tutorial and I didn't take any progress pics, so I hope its helpful!
Measure your head, add a couple of inches for seams and such, and divide by 4. Cut the fabric into 4 triangle shaped pieces with a slightly circular bottom, this will be the main part of the hat.
Take the first 2 triangles and flip them inside out, line them up, bottom, and then top, and pin together so it starts to form a circular shape. Sew.
Take the next piece of triangle and sew in the matter you did before. Do this with the 4th piece, and then pin and sew to the first piece. You've complete the hat part!
Measure around the hat to see what the circumference is. Take this measurement, and cut a strip of fabric about 6" high and however wide (mine was 33 inches) and then flip it inside out, sew it into a tube. I did this for ease. Sew seams on one end, because my measurement was a bit off and I had to cut and resew for the final seam.
Decide what part to be the back of the hat, and start there, at the beginning of one of the triangles. Pin around the triangle, and sew. Move the fabric up, pin around the second triangle and sew. Continue until you are all the way around. If you know of an easier way, do it, because I was just guessing!
Cut out a brim, if you want to add one, on two pieces of fabric. Flip them inside out, sew one side. Cut out a piece of cardboard, or whatever is preferred, and put it inside the brim.
Attach the brim to the hat. Pin it up so it looks to your liking, and then sew away. Remember what part is the front and back, you'll want it on the front.
Extra. If you want, put a button on the top and sew it on really well to complete the top circle. If not, just finish the top by hand.
Thanks! C&C welcome. Enjoy!