《梦溪笔谈·故事二》
近年京城人士穿着官服乘马时，用浅黑色的衣服蒙在官服外，称为 凉衫 ，也是古代遗传下来的做法。
近歳京师士人朝服乘马，以黪衣蒙之，谓之 凉衫 ，亦古之遗法也。
In recent years, when people in the capital wear official uniforms and ride horses, they cover their official uniforms with light-colored clothes, which are called "liangshan". This is also a practice handed down from ancient times.