Step 1: Create a brim template. Cut out two circles from the cardboard, one slightly larger than the other. The smaller circle should be about 4 inches in diameter and the larger one should measure around 8 inches in diameter. 

Step 2: Cut out your felt pieces. Trace around your template onto the felt and cut it out with scissors or a craft knife. You will need to cut two of each size for the top and bottom of the hat, as well as four strips that are 3-4 inches wide for creating the sides of the hat. 

Step 3: Sew together your felt pieces. Pin or clip all four pieces together so they don’t move while you sew them together with a sewing machine or by hand using thread and needle. Make sure to leave an opening at one end so you can turn it right side out when finished. 

Step 4: Add interfacing (optional). If desired, add interfacing to give structure to your bowler hat before turning it right side out and shaping it with a steamer/hat blocking kit (see below). 

Step 5: Turn right side out and shape with steam/hat blocking kit (optional). Once all of your seams are sewn together, turn your bowler hat right side out through the opening left in Step 3 above. Use a steamer or plastic form from a hat blocking kit to shape your bowler hat into its final shape before finishing off any edges that may need trimming down or securing shut with stitches if necessary.
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