Hello. while clearing my late father in laws house we found a black army cap with red piping and the badge of Royal Army Ordnance Corps which was his brothers unit as dad was in the Pay Corps. All the photos show them in khaki so we are wondering why the cap is black and how did he get to keep it? We found letters about returning army property. It is surprising the amount of work that went into making a cap. I tried to attach a photo of it but it won't do it. Thank you