Had a rummage and unearthed things I forgot I had:
The blue 1/2 sleeve shirt with original logo from the correct factory clothing supplier that is specifically referenced in part III if this English language 1972 VW-Porsche original document giving the full list of basic workshop equipment required to be accredited as factory approved 1* 2* 3* service operation corresponding to the glovebox sized service network dealer list publication.
Attachment 386115
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Attachment 386126
Also the ruby racing jacket modelled in the 1973 accessories brochure along with the then current M492. Think these are quite rare? An example of this jacket appears elsewhere in this thread but but photo of my example close-up shows details like the crest, the large orange zip pull, use of soft elasticated panels for the slim look favoured in 70s and the pockets on body/ arms...it also has a rain hood that tucks up into collar.
Attachment 386127
May have to give it an airing at the Silverstone Historic
Attachment 386123
Steve