Wikipedia
Yuanlingshan is a form of traditional Chinese attire. It is a formal attire worn by men. It is also the most common form of attire for (both male and female) officials and nobles during the Ming Dynasty. The difference between civilian's and officials'/nobles' yuanlingshan is that officials'/nobles' yuanlingshan has a mandarin square on it. The sleeves of the yuanlingshan are mostly curved with a narrow sleeve cuff (琵琶袖, pipa sleeve). It has round collar and side slits. Men's yuanlingshan (regardless of civilian's/officials') have side panels at the side slits to conceal the undergarments. The collar is secured with a button, and a crossed-collar undergarment must be worn. However, yuanlingshan is not worn alone. Underneath the Yuanlingshan is worn the Da Hu (褡護, sleeveless or half sleeve vest with side panels) and the Tie Li (貼裏，men's inner dress, sometimes replaced with the Zhi Shen). According to the Ming's Government letter against Toyotomi Hideyoshi, the Ming Government bestowed on him a set of Chang Fu containing a red yuanlingshan with kirin mandarin square, dark blue Da Hu , and green Tie Li .
During an Imperial Funeral, Ming officers wore a grey blue Yuanlingshan (without Mandarin Square), buffalo horn panel belt and wushamao. This set was known as 'Qing Su Fu' .