Place the two brim pieces on top of each other, right sides facing in and wrong sides facing out. Pin in place. When you insert the straight pins, slide them into both layers around the shared edge. You need to use enough pins to prevent the two layers from moving around along the edge, since the edge is where you must sew the brim together to start with. Use a fabric pencil or a piece of chalk to sketch out a smaller circle in the center of the larger brim circle. This circle should be about as big around as the size of your head.  This circle will eventually become the opening for your head, which is why it needs to be the same approximate size. Use a tape measure to measure the circumference of your head to verify that the circle in the center of your brim piece matches. Usually, the inner circle will be about 6 inches (15.24 cm) in diameter. Use a sewing machine or a needle and thread to sew around the outside edge of the pieces, leaving a seam allowance of about 1/8 inch (3.176 mm).  Do not sew along the edge of the inner circle yet. When done, you should have a solid, round disk with a circle marked in the center. Remove the pins as you sew or after you finish. Use sewing scissors or shears to cut alone the outline you marked at the center of the brim. Cut from the inside of the circle, not along the outside. If you have difficulty keeping the pieces from shifting or moving around at the center, you could remedy the situation by pinning around the outside of the drawn circle before cutting that circle out. Doing so should limit the amount of movement. Pull the brim right-side out by turning it through the opening you created by cutting out the center of the brim. Iron flat, if possible, so that the material is easier to work with. Stitch up the open center of the brim using a sewing machine or needle and thread. Leave a seam allowance of 1/4 inch (6.35 mm). As before, if you find that the fabric around the center opening continues to move around, pin around the opening to restrict this movement.

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Write a summary of the previous text in Indonesian:
Tumpukkan potongan tepinya. Buat lingkaran di tengah potongan tepian topi. Jahit potongan tepiannya. Singkirkan bagian tengah dari tepian topi. Balikkan tepian topi. Jahit sisa bagian tepi.