British Army PCS Thermal JacketA smart casual, thermal jacket at first you wouldn't expect this jacket to be British Army surplus! On closer inspection, the rank tab gives a hint. As part of the British military's Personal Clothing System (PCS), these were to be worn in colder regions, layered appropriately. These jackets have light polyester lining for heat retention and has a cosy, cloud like loft to it. Drawstrings to the neck and bottom hem help keep cold from creeping in too.