TBH a pilot would nip down to the local shop, grab a map, pay the chap, Bob's your Uncle and Fanny's your Aunt.
The AM did release maps though to pilots; BoB versions are extremely scarce now-a-days.
A simple map would have been made from paper (maybe linen-backed), and nice pre-war examples often come with a nice thick, brown paper cover; usually nicely AM marked too.
There ya go
Don't muck around with that poncy silk and rayon malarky, they were produced from these materials but they had a specific reason; usually to do with escape/evasion if my memory serves me correctly. The tissue maps were made for escape, and were made to fold easily. These bore some resemblance to a handkerchief. However, this is post-BoB
