Can someone explain 衣锦尚炯 character by character? I tried wiktionary but to no avail 😰 This is supposed to mean "She covered her brocade gown with a plain robe." Source: http://www.acmuller.net/con-dao/docofmean.html
You probably mean 衣錦尚絅 here.
絅：unlined outer garment, usually made from linen
Literally the phrase means "To wear brocade inside, and add linen overall robe outside"
The phrase is a metaphor that real noble people would hide their virtues under humbleness.