|Kickass leather flight jacket not included.|
Back in the day, pilots were issued escape and evasion maps, printed on silk, so they could be sewn inside a flight jacket, and allow someone shot down to carry the necessary guide in hand, or hidden inside one's clothes.
If you lost your old one, never had one, or just want the option, there's a company called Silk Maps, and the fine folks there will be happy to rectify that lack, for any place in the world, for $50. Any location, you zoom the scale, the measurements will be imperial or metric at your choice, and you can do it in topo, street map, or satellite view.
Recreate the memento you never had of some faraway conflict. Make a map in advance for a trip, and make it a souvenir of an adventure. Or exactly as intended, make yourself a just-in-case map to get out of Dodge, come the zombie apocalypse.
Note these are new made, not retro, nor period accurate for anything but right now. But you can add them to appropriate attire (see flight jacket above), or assemble a collection of them and sew them into anything.
They're 2' square and 100% silk, so you can also use it as a scarf, handkerchief, bandana, or assemble enough to make an entire garment. You're paying for them.
I thought the fact that someone decided these things were worth creating new was notably genius, and the maps are actually quite useful, so I thought you might appreciate them too.
This is how a two-hour wander around the interwebs turns into a useful blog post.