I made some more adjustments in my cadet cap sewing. The last caps needed a bit more tightness, so I added a headband, which helped. I had ordered some more heavier weight interfacing for cap bills. In error, the interfacing that I received was fusible on both sides. I didn't think I liked that, but it turned out to make a much better bill. I has just the right flexibility and stiffness.
I used left over chino trowser fabric as before. It's both tough and soft and pliable.