I made a hat with the leftover fabric from my boiled wool jacket.
I chose a plate that was about the size I wanted the crown and cut out a circle. Then I measured a length of fabric that went around my head, but I made it a bit deeper than I wanted the hat so I could add some tucks, and of course the seam allowance.
After joining the seam 3 rows of pin tucks were stitched , the bottom one became the hem because when I tried it around my head it looked right. My original plan was to add a band but I like it as it is.
If you would like to see how it looks on then have a look on my facebook.