Typically this means a dress for the ladies (short as opposed to long). Everyone has their go- to- dress or their favorite little black dress that probably fits under the “cocktail attire” category. You can change the look of your favorite dress by accessorizing it in different ways each time. If you don’t feel like wearing a dress you can always go for a really nice pair of slacks with a nice blouse. Snaz it up a bit with your favorite heels and jewelry.
Men should probably wear a suit, tie or no tie.