... such as crepe de chine, georgette, chiffon, grosgrain, peau de soie, dull finish charmeuse and taffeta, and all plain woolen materials, are suitable for deepest mourning. Uncut velvet is as deep mourning as crepe, but cut velvet is not mourning at all! Nor is satin or lace. The only lace permissible ... — Etiquette • Emily Post
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