Topics: CAVANAGH FORCED TO MOVE HAT SHOP - The New York Times
A fedora / f ɪ ˈ d ɔː r ə /  is a hat with a soft brim and indented crown.   It is typically creased lengthwise down the crown and "pinched" near the front on both sides.  Fedoras can also be creased with teardrop crowns, diamond crowns, center dents, and others, and the positioning of pinches can vary. The typical crown height is 4.5 inches (11 cm).
The brim is usually approximately 2.5 inches (6.4 cm) wide, but may be wider,  can be left "raw edged" (left as cut), finished with a sewn overwelt or underwelt, or bound with a trim-ribbon. "Stitched edge" means that there is one, two or more rows of stitching radiating inward toward the crown. The "Cavanagh Edge" is a welted edge with invisible stitching to hold it in place and is a very expensive treatment that can no longer be performed by modern hat factories. 
The term fedora was in use as early as 1891. Its popularity soared, and eventually it eclipsed the similar-looking homburg.