What Is Cocktail Attire? Cocktail wedding attire is a slightly more elevated dress code than semi-formal attire but is less formal than formal wedding attire (also known as black-tie optional). However, there are a few nuances that help differentiate a cocktail attire wedding from a semi-formal wedding. For both dress codes, a suit is preferable for men, while women should opt for a cocktail dress or formal jumpsuit. "Cocktail attire challenges you to be creative," says Greg Shugar, CEO and Creative Director of Beau Ties Ltd. "No color is off limits. No pattern is off-limits. And no specific mix or color or pattern is off limits." If you do find yourself confused about what to wear to a cocktail wedding, allow the invitation to give you clues. "Start with the location, time of day and time of year," says Shugar. "All should give clues right away." An upscale location, like a five-star hotel, would require a more formal outfit, while lighter colors and fabrics would be perfectly suitable for a beach wedding, even for a cocktail attire dress code.