Harris Tweed Flat Cap Navy Blue Herringbone Etsy Harris Tweed Charcoal Herringbone Flat Cap (one Size Fits All) Etsy Harris Tweed Flat Cap in navy herringbone Highland Store Gents Authentic Harris Tweed Navy Herringbone Flat Cap Failsworth Harris Tweed Herringbone Oban Flat Cap Earflaps Navy Blue Harris Tweed Flat Cap Navy Blue Herringbone Etsy. Choose this Harris Tweed flat cap in Navy Herringbone as the perfect accessory for any outfit whether it be in the city or in the field. It has a sewn down brim, quilted lining and a grosgrain sweatband for additional comfort and warmth. 100% Wool Quilted Satin Lining: 100% Polyester Grosgrain Sweatband Sewn Down Brim Removable Side Pin Woven in Scotland