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What Is Cocktail Attire? Dress Codes for Proms, Weddings & Events 2025 Everyone talks about cocktail attire like it is a hard rule for fancy events. Did you know that Christian Dior first named the ‘cocktail dress’ in 1948, setting the modern standard for evening style? Most people think cocktail attire means rigid, uncomfortable outfits. Turns out this dress code is one of the most creative ways to express your own style while still looking perfectly polished at proms, weddings, and beyond …