Brixton Post Flannel. The Brixton Post Flannel delivers classic workwear-inspired style with a soft, comfortable feel. Crafted from soft flannel, this men’s shirt features an allover plaid pattern and a traditional collar for a timeless look. Dual chest pockets with flap closures add functional detail, with a woven Brixton label on the left chest pocket for a signature finish. A button-front design and long sleeves with button cuffs complete this versatile layer, making it an easy choice for everyday wear or cool-weather layering. 60% Cotton 23% Polyester 17% Acrylic. Imported.