an old sweater (can be wool, but doesn’t have to be)
Choose a sweater that has ribbing at the bottom.
Use a hat that already fits as your pattern. Lay it down on the sweater and cut around it to create the shape of the two pieces you’ll need for your hat. You’ll cut two pieces.
Sew them together along the edges, right sides in, leaving the bottom, ribbed part open.
Add any embellishments to your hats, like buttons, crocheted elements, etc. Be creative and have fun!