Research shows the need for pedestrians to wear retro-reflective material during nighttime hours. Several studies found that pattern and movement recognition of a pedestrian lead to greater detection and recognition (pattern of material and placing retro-reflective material on body parts that are associated with movement), that will lead to better visibility for pedestrians.
Also several studies has shown that fluorescent red orange was much more detectable than white retro-reflective material.
We have even placed some retro-reflective material at a distance of 384,467 kilometers, on the Moon. This is probably the most spectacular usage of retro-reflective material:
Lunar Ranging Retro Reflector
There are currently 5 different retro-reflectors on the Moon. Astronauts on the Apollo 11, 14, and 15 missions left retro-reflectors on the Moon as part of the Lunar Laser Ranging Experiment. The Soviet Lunokhod 1 and Lunokhod 2 rovers also carried smaller arrays.
The ongoing Lunar Laser Ranging Experiment measures the distance between the Earth and the Moon using laser ranging. The first successful tests were carried out in 1962 when a team from the Massachusetts Institute of Technology succeeded in observing laser pulses reflected from moon's surface using a laser with a millisecond pulse length. The Earth–Moon distance has been measured with increasing accuracy for more than 35 years.
So do like the Moon; always wear retro-reflective material during night time hours :)
Here are some cool pictures of the retro-reflective material on the moon taken by the astronauts, and the laser at The Goddard Space Flight Center.