Here are some baseball cap paper crafts, they are designed by Sinner, Greenelf and Margaret293. There are also a blank papercraft template for this. You can download them from here: Baseball Caps Papercraft Free Download
For this paper model, we recommend that you use the material (Paper, Paint, Glue, etc.) to make. Here are Great Deals, and here are 100s of card making ideas. There is FREE sewing patterns that you may need.