I used to teach a youth wilderness survival course at the planetarium in the late 70's, and the first rule I introduced was "be prepared to be unprepared". This means pack stuff according the worst scenario your mind can perceive, then prepare your mind to cope with what you have forgotten to pack. When checking students' packs, I always found the girls to have one key component that the boys did not. Perhaps it was inadvertent, and due to vanity, but the girls almost always packed a mirror. :thumbup:
When I was guiding wilderness trips I often suggested to the women who were going into the woods for the first time to bring a small mirror, small hair bush, lipstick, etc. Being in an alien environment for the first time can be off-putting for city people, and having some of their 'comfort toys' enabled them to relax and enjoy it a lot more, especially at night time 'in the deep, dark woods with scary things all around...' And as you said, having that mirror, once they were shown how to use it to signal, was a great tool in an emergency.
Stitchawl