Come as you Are!
Translation: Flexible but not sloppy—even a laid-back daytime happening is still a party. You can wear anything from jeans to a dress to a relaxed suit, like this camel ensemble on model and actress Carol Alt. 

Variations: Infinite. Sporty clothes at a party? Controversial, but we approve if they're well cut and a bit dressy (velours, cashmere). 

AKA: "Dress as you please," "day clothes," "smart day," "smart attire."