Fill the tea kettle with water and place on heat. Heat the water till you get a strong and steady stream of steam running from the spout.
Hold the hat by the brim and rotate it in front of the steam so that the whole crown is moistened and softened. Do it quickly under strong steam pressure so that the entire crown is steamed in less than thirty seconds.
Use your hands to shape the crown while the straw is soft and can be mould into shape. Do this very quickly because it will take less than thirty seconds for the straw to cool down and harden. If you are not with the processing, do the steam process again and shape the crown.
Now is the time to shape the brim. Hold the hat in away in your hands from the apposite side of where you will rotate the hat for steaming the brim. Rotate the brim in the steam, keeping your hands away from the steam. Steam both the upper and under side of the brim.
Use your fingers to brim according to your choice while it is soft and hot with the steam. Do this process quickly. If you are not satisfied the first time, repeat the steam to mould further. You can re-steam and re-shape the hat until you are satisfied with how it looks.