modeling black tie optional

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Casual Chic
Translation: The rule—mix a dressy element, like this elaborate velvet jacket, with something more informal, like jeans. "Slacks and a leather jacket are usually as fancy as I get," says actor Djimon Hounsou. 

Variations: Contrasting fabrics are key. A charmeuse blouse lends razzle-dazzle to gray flannels; a sharply tailored shirt tones down palazzo pants. 

AKA: "Smart casual," "dressy casual," "casual threads," "informally fabulous," "simple and chic."