Tradução de "Best crepe"

“A lady of my acquaintance, who had lost her husband, was receiving such a visit in her best crape.”
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Certainly it´s in a (gossipy) metaphorical sense: "in her best clothes/attire" (perhaps even suggesting that she was dressed to kill - or dressed to the nines).

One meaning of crepe is:
Crepe is a thin fabric with an uneven surface and is made of cotton, silk, or wool.
https://www.collinsdictionary.com/dictionary/english/crepe