Mine is this little tidbit about Khaki’s from https://www.heddels.com/2019/05/history-khaki-anything-drab/
“Tried and tested by all the major powers, khaki-dyed, lightweight cotton twills became the de facto uniform for any colonizing power. If you were going to ship your boys abroad to pillage and conquer someplace in the Southern Hemisphere, khaki was your go-to color.”
It was actually rather successful! Some papers about this research are available here (first use of a microwave to thaw living rats) and here (comparison of some other warming methods), and there’s a good Tom Scott video on the experiment as well.