In a previous thread there was discussion about the use of a spun silk lining in the original maker contracts per the original spec though a single example has not been found; only cotton (re-linings or post WWII jackets excluded). Excellent idea someone posted was why not read the spec and maybe it would explain why a spun silk lining has not been found. Just got the first response back from the US government and they said they don't have a copy. So, need to keep searching. Does anyone have a copy they can post?