Ryan...in this case the interior does denote something specific..."Offizier Kleiderkasse-Berlin".Private purchase linings are not the issue here.....the issue is that the cap is a Luftwaffe enlisted cap....with an "Offizier Kleiderkasse-Berlin" lining and Logo.AND...that the cap appears to be in such poor condition that it could very possibly be a patched together job.I could be wrong.....and I welcome anyone else to jump in and correct me if I am....but an "Offizier Kleiderkasse-Berlin" lining and Logo....are not Kosher in a Luftwaffe EM cap.