The brightly colored inner layer found in certain aviation jackets serves a crucial purpose beyond mere aesthetics. This vibrant hue, often a specific shade of international orange, was chosen for its high visibility. A downed pilot, particularly in challenging terrain or water, could reverse the jacket, exposing the conspicuous color, significantly increasing the chances of being spotted by rescue personnel.
This practical design feature became a hallmark of military-issued flight jackets, especially during the mid-20th century. The enhanced visibility offered by this contrasting inner layer provided a vital safety measure for aviators operating in hazardous conditions. Its adoption reflects a broader emphasis on pilot safety and survival, underscoring the importance of readily identifiable signals in emergency situations. This feature continues to be valued in both military and civilian aviation contexts.