From the Steam Geek archives-

Not about technology, but interesting. The Covert Side of Reconstructing History.

This work will allow the novice re-enactor of Resistance and Special Operations Executive agents to select clothing and accoutrements appropriately — with historical accuracy. The portrayal of civilians — whether clandestine operatives or real civilians — in World War II reenactment circles has been the topic of hot debate, as some reenactors in the past have been, shall we say, less than exemplary in their chosen impression. We intend to change that. The organisation which sponsors this work reveres historical accuracy. The best way to achieve accuracy is through thorough and often cumbersome research, from which conclusions are drawn and standards adopted. Since this method has been followed, therefore, all the following conclusions may be considered accurate. By no means does this imply that the following are dogma, never to be gainsaid. If new information and research is brought to our attention, we shall at once join the queue to peruse it. If we, after the normal course of debate, find our earlier conclusions to be faulty, we will change them. We (especially Bob, who can barely read) do not pretend to be PhD-level experts on WWII-era fashion, textiles, and such; we just follow the pictures.

In a similar vein- the Churnet Valley Railway 1940s weekend.