《晋书·志·第十七章》
当初，魏做白恰，在前面横缝以区别于后面，叫作颜恰，流传开来。
初，魏造白帢，横缝其前以别后，名之曰颜帢，传行之。
In the old days, Wei Zhuobai clamped it down, with a horizontal stitching in front to distinguish it from the back, called yanqie, which has been passed down.