For women, festive attire usually means a semi-formal cocktail dress or dressy separates that have a fun, holiday feel. For men, business casual attire is usually appropriate, though men often choose to wear a festive or seasonally themed tie.
Red and gold dresses with a hint of sequins or other sparkly embellishments are good festive attire choices for women. Other metallic shades, such as silver and rose gold, along with jewel-toned dresses in a fabric with a hint of sheen also work well. Semi-formal black dresses are always a safe choice, especially when dressed up with a strand of pearls or sparkly accessories. Men can wear a seasonally appropriate blazer or a nice sweater with slacks and a collared shirt.