《明史·志·卷四十二》
红色绫罗作蔽膝，上面宽一尺，下面宽二尺，长三尺，织上火、龙、山三种图纹。
红罗蔽膝，上广一尺，下广二尺，长三尺，织火、龙、山三章。
The red silk is used as a knee cover, one foot wide at the top, two feet wide at the bottom, three feet long, with three patterns of fire, dragon and mountain woven on it.