《梦溪笔谈·故事一》
本朝的幞头，有叫做直脚、局脚、交脚、朝天、顺风的五种，只有直脚的一种是不论贵贱都通行服用的。
本朝幞头有直脚、局脚、交脚、朝天、顺风，凡五等。唯直脚贵贱通服之。
In this dynasty, there were five kinds of headwear: straight legs, square legs, crossed legs, upturned legs, and downwind legs. Only straight legs were commonly used regardless of status.