http://www.silkmaps.com/
http://escape-maps.com/
http://abcnews.go.com/Technology/monopolys-hidden-maps-wwii-pows-escape/story?id=8605905
You can buy some (at fairly reasonable prices) at:
http://www.omnimap.com/catalog/access/silkmaps.htm
The costume connection is that after World War 2, military surplus
escape maps were made into blouses, etc.
Fran
Lavolta Press
Books on making historic clothing
www.lavoltapress.com
www.facebook.com/LavoltaPress
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