A headwear style constructed from multiple triangular fabric panels (usually six) sewn together at the top and finished with a fabric-covered button. The front features a stiffened brim or bill, traditionally reinforced with cardboard or plastic, to block the sun. The back is often left partially open and fitted with an adjustable strap, snapback, or elastic band for sizing.
Heard on the job
We need to reinforce the front two panels with heavy buckram so the baseball cap holds the embroidered logo properly.