Philly Chain Stitch. The 'Field Trip™' is our most popular hat style with its 6 panel unstructured crown. Its build is derived from our nostalgia for vintage workwear hats. The timeless hats are made of brushed cotton fabric and feature a fabric strap with brass metal clasp. Brushed Cotton Fabric Fabric Strap with Brass Metal Closure. One Size Fits All. Cactus with Cream Stitching Imported.