👉 The word "Mountain Khakis" comes from a Greek word meaning "loose clothing." In ancient Greece, military leaders wore loose, flowing garments as they walked on mountain passes to lead troops into battle. Definition: A garment worn by soldiers during combat in order to cover their legs and protect them from the elements. It is often made of woven or cotton fabric and can be found in a variety of colors and designs that reflect the soldier's rank and status.