From Elbe Textiles:
The Serpentine Hat is an easy and quick design to sew. This wide brim hat is fully lined, with the ability to be reversible.
Suggested Fabric: Main: Denim, canvas, cotton drill, other medium/heavy weight woven fabrics that hold their structure. Lining: Medium/heavy weight structured woven fabrics
Finished Brim Width: 12cm / 4.7 inches
Sizes: 4 Sizes to fit 21–24" inch head circumference