Iron Heart is channeling the classics with their take on the iconic CPO Shirt in a heavyweight indigo denim. Weighing in at 18oz., it’ll come into its own this winter as a jacket or layering piece.

As to be expected from the Japanese masters of heavyweight denim, details are a plenty. Made in Japan, the CPO Shirt features oversized copper snaps with brand detailing, side seam gussets with selvedge and chain stitch run-off, as well as twill lined cuffs, collar stand and side pocket linings. With some western detailing thrown in for good measure, this CPO is distinctly Iron Heart.

Available for $385 at Franklin & Poe.